fix: correct Live 24/7 handling and label regressions

- stream.updateWithIssue: 'Live 24/7: Yes' meant the stream IS 24/7, but it
  was assigned straight to isNot247, inverting the label. A 'No' answer was
  also ignored because the guard skipped falsy values.
- dataSet.getBoolean: an unanswered dropdown is stored as '' by
  parseIssueBody, which getBoolean read as false. Treat it as undefined so
  'no answer' means 'leave unchanged' instead of 'Not 24/7'.
- update.addStream: has() is true for an unanswered field, so it produced
  isNot247 = true for issues that left the dropdown blank.
- generate: sortBy got five orders for four iteratees.
- 2_streams_edit.yml: restore the '~' reset option dropped from the quality
  dropdown when the Label field was removed.
- stream.getLabels: use const to satisfy prefer-const.

scripts/models/stream.ts

@@ -53,8 +53,8 @@ export class Stream extends sdk.Models.Stream {
     const live247 = dataSet.getBoolean('live_247')
     const geoBlocked = dataSet.getBoolean('geo_blocked')
 
-    if (live247) this.isNot247 = live247
-    if (geoBlocked) this.isGeoBlocked = geoBlocked
+    if (live247 !== undefined) this.isNot247 = !live247
+    if (geoBlocked !== undefined) this.isGeoBlocked = geoBlocked
 
     const quality = dataSet.isDeleted('quality') ? '' : dataSet.getString('quality')
     const httpUserAgent = dataSet.isDeleted('http_user_agent')
@@ -435,7 +435,7 @@ export class Stream extends sdk.Models.Stream {
   }
 
   getLabels(): string[] {
-    let labels: string[] = []
+    const labels: string[] = []
     if (this.isNot247 === true) {
       labels.push('Not 24/7')
     }