refactor(GuildChannelManager): Remove redundant edit code

[Jiralite]

Please describe the changes this PR makes and why it should be merged:
Removes redundant code, such as this:

- (options.name ?? channel.name).trim(),
+ options.name,

In this example, .trim() is redundant as the API performs trimming. The ?? is also redundant (here and later in the code) as the properties are optional. Methods like these work just fine still:

await channel.setRTCRegion(null);

// " hello " is trimmed API-side.
await channel.edit({ name: " hello ", bitrate: 96000, userLimit: 13, rtcRegion: null });

Also avoided reassigning the parameter.

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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[SpaceEEC]

👍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.52%. Comparing base (3654efe) to head (8ac7876).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10370      +/-   ##
==========================================
+ Coverage   50.38%   50.52%   +0.14%     
==========================================
  Files         228      228              
  Lines       20633    20705      +72     
  Branches     1236     1252      +16     
==========================================
+ Hits        10396    10462      +66     
- Misses      10193    10199       +6     
  Partials       44       44              

Flag	Coverage Δ
builders	95.78% <ø> (-0.12%)	⬇️
formatters	99.33% <ø> (+0.02%)	⬆️

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