fix(ThreadChannel): Allow editing flags

[Jiralite]

Please describe the changes this PR makes and why it should be merged:
Allowing threads to edit flags which was overlooked in #8637.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

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1 Ignored Deployment

Name	Status	Preview	Updated
discord-js	⬜️ Ignored (Inspect)		Sep 24, 2022 at 1:55PM (UTC)

[codecov]

Codecov Report

Merging #8671 (bd90a08) into main (b1e190c) will decrease coverage by 13.21%.
The diff coverage is n/a.

❗ Current head bd90a08 differs from pull request most recent head dd3defc. Consider uploading reports for the commit dd3defc to get more accurate results

@@             Coverage Diff              @@
##              main    #8671       +/-   ##
============================================
- Coverage   100.00%   86.78%   -13.22%     
============================================
  Files           39       85       +46     
  Lines         3200     8772     +5572     
  Branches       410     1109      +699     
============================================
+ Hits          3200     7613     +4413     
- Misses           0     1117     +1117     
- Partials         0       42       +42     

Flag	Coverage Δ
builders	100.00% <ø> (ø)
collection	100.00% <ø> (?)
proxy	80.46% <ø> (?)
rest	91.99% <ø> (?)
utilities	100.00% <ø> (?)
voice	63.83% <ø> (?)
ws	60.47% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ixins/ApplicationCommandOptionChannelTypesMixin.ts	100.00% <0.00%> (ø)
packages/voice/src/joinVoiceChannel.ts	100.00% <0.00%> (ø)
packages/voice/src/receive/SpeakingMap.ts	100.00% <0.00%> (ø)
...src/strategies/context/IContextFetchingStrategy.ts	100.00% <0.00%> (ø)
packages/voice/src/util/entersState.ts	100.00% <0.00%> (ø)
packages/ws/src/utils/IdentifyThrottler.ts	100.00% <0.00%> (ø)
packages/voice/src/VoiceConnection.ts	81.76% <0.00%> (ø)
packages/voice/src/networking/VoiceUDPSocket.ts	90.47% <0.00%> (ø)
.../src/strategies/sharding/WorkerShardingStrategy.ts	95.87% <0.00%> (ø)
packages/voice/src/networking/VoiceWebSocket.ts	0.00% <0.00%> (ø)
... and 37 more

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