Update web.magentatv.de.

Test:

```sh
npm test --- web.magentatv.de

> test
> run-script-os web.magentatv.de

> test:win32
> SET "TZ=Pacific/Nauru" && npx jest --runInBand web.magentatv.de

 PASS  sites/web.magentatv.de/web.magentatv.de.test.js
  √ can generate valid url (2 ms)
  √ can generate valid request method (1 ms)
  √ can generate valid request headers (2 ms)
  √ can generate valid request data (3 ms)
  √ can parse response (3 ms)
  √ can handle empty guide

Test Suites: 1 passed, 1 total
Tests:       6 passed, 6 total
Snapshots:   0 total
Time:        0.599 s, estimated 1 s
Ran all test suites matching /web.magentatv.de/i.
```

Grab:

```sh
npm run grab --- --site=web.magentatv.de

> grab
> npx tsx scripts/commands/epg/grab.ts --site=web.magentatv.de

starting...
config:
  output: guide.xml
  maxConnections: 1
  gzip: false
  site: web.magentatv.de
loading channels...
  found 348 channel(s)
run #1:
  [1/696] web.magentatv.de (de) - 132 - Jan 11, 2025 (9 programs)
  [2/696] web.magentatv.de (de) - 132 - Jan 12, 2025 (11 programs)
  ...
  [695/696] web.magentatv.de (de) - SkyOne.de - Jan 12, 2025 (38 programs)
  [696/696] web.magentatv.de (de) - SkySport9.de - Jan 11, 2025 (2 programs)
  saving to "guide.xml"...
  done in 00h 04m 59s
```

Signed-off-by: Toha <tohenk@yahoo.com>

sites/web.magentatv.de/web.magentatv.de.config.js

@@ -5,7 +5,7 @@ const customParseFormat = require('dayjs/plugin/customParseFormat')
 const { upperCase } = require('lodash')
 
 let X_CSRFTOKEN
-let COOKIE
+let Cookie
 const cookiesToExtract = ['JSESSIONID', 'CSESSIONID', 'CSRFSESSION']
 
 dayjs.extend(utc)
@@ -17,10 +17,9 @@ module.exports = {
   url: 'https://api.prod.sngtv.magentatv.de/EPG/JSON/PlayBillList',
   request: {
     method: 'POST',
-    headers: function () {
-      return setHeaders()
+    async headers() {
+      return await setHeaders()
     },
-
     data({ channel, date }) {
       return {
         count: -1,
@@ -40,8 +39,8 @@ module.exports = {
       }
     }
   },
-  parser: function ({ content }) {
-    let programs = []
+  parser({ content }) {
+    const programs = []
     const items = parseItems(content)
     items.forEach(item => {
       programs.push({
@@ -166,23 +165,13 @@ function parseItems(content) {
 
 async function fetchCookieAndToken() {
   // Only fetch the cookies and csrfToken if they are not already set
-  if (X_CSRFTOKEN && COOKIE) {
+  if (X_CSRFTOKEN && Cookie) {
     return
   }
 
   try {
     const response = await axios.request({
       url: 'https://api.prod.sngtv.magentatv.de/EPG/JSON/Authenticate',
-      headers: {
-        accept: 'application/json, text/javascript, */*; q=0.01',
-        'content-type': 'application/x-www-form-urlencoded; charset=UTF-8',
-        'sec-fetch-dest': 'empty',
-        'sec-fetch-mode': 'cors',
-        'sec-fetch-site': 'same-origin',
-        'x-requested-with': 'XMLHttpRequest',
-        Referer: 'https://web.magentatv.de/',
-        'Referrer-Policy': 'strict-origin-when-cross-origin'
-      },
       params: {
         SID: 'firstup',
         T: 'Windows_chrome_118'
@@ -191,10 +180,9 @@ async function fetchCookieAndToken() {
       data: '{"terminalid":"00:00:00:00:00:00","mac":"00:00:00:00:00:00","terminaltype":"WEBTV","utcEnable":1,"timezone":"Etc/GMT0","userType":3,"terminalvendor":"Unknown"}',
     })
 
-
     // Extract the cookies specified in cookiesToExtract
     const setCookieHeader = response.headers['set-cookie'] || []
-    let extractedCookies = []
+    const extractedCookies = []
     cookiesToExtract.forEach(cookieName => {
       const regex = new RegExp(`${cookieName}=(.+?)(;|$)`)
       const match = setCookieHeader.find(header => regex.test(header))
@@ -205,7 +193,6 @@ async function fetchCookieAndToken() {
       }
     })
 
-
     // check if we recieved a csrfToken only then store the values
     if (!response.data.csrfToken) {
       console.log('csrfToken not found in the response.')
@@ -213,19 +200,15 @@ async function fetchCookieAndToken() {
     }
 
     X_CSRFTOKEN = response.data.csrfToken
-    COOKIE = extractedCookies.join(' ')
+    Cookie = extractedCookies.join(' ')
 
   } catch(error) {
     console.error(error)
   }
 }
 
-function setHeaders() {
-  return fetchCookieAndToken().then(() => {
-    return {
-      X_CSRFTOKEN: X_CSRFTOKEN,
-      'Content-Type': 'application/json',
-      Cookie: COOKIE
-    }
-  })
+async function setHeaders() {
+  await fetchCookieAndToken()
+
+  return { X_CSRFTOKEN, Cookie }
 }