fix: resolved more issues

[kyranet]

notMutedMemberAddInitialRole was reporting errors that indicated outdated cache, which is an uncommon issue in the library. As such, I've updated the event to handle errors reactively rather than relying on the cache. This should fix the issue.

Also fixes an issue in the same event resetting the wrong key, since it was checking role's truthiness rather than initial's like the selection does.

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (1d7cac3) 88.73% compared to head (fb08b89) 88.46%.

Files	Patch %	Lines
src/lib/util/common/promises.ts	20.00%	8 Missing ⚠️
src/lib/util/functions/pieces.ts	60.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2533      +/-   ##
==========================================
- Coverage   88.73%   88.46%   -0.27%     
==========================================
  Files          88       89       +1     
  Lines        3630     3650      +20     
  Branches      281      281              
==========================================
+ Hits         3221     3229       +8     
- Misses        403      415      +12     
  Partials        6        6              

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