fix: username not changing when editing incoming webhook

[dieselftw]

Proposed changes (including videos or screenshots)

Currently, changing the "Post as" field while editing incoming webhooks does not change the value. This PR aims to resolve the same.

Before:

2024-01-13.23-51-47.mp4

After:

2024-01-13.23-50-41.mp4

Issue(s)

fixes #31425

Steps to test or reproduce

1. Open an existing webhook integration
2. Change the contents of the Post as field
3. Save it

Further comments

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Latest commit: f9a4072

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.31%. Comparing base (cb9c6ba) to head (f9a4072).
⚠️ Report is 3659 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #31442      +/-   ##
===========================================
- Coverage    54.33%   54.31%   -0.02%     
===========================================
  Files         2276     2269       -7     
  Lines        50124    50040      -84     
  Branches     10220    10358     +138     
===========================================
- Hits         27233    27179      -54     
+ Misses       20406    20375      -31     
- Partials      2485     2486       +1     

Flag	Coverage Δ
e2e	53.13% <ø> (-0.04%)	⬇️
e2e-api	39.88% <ø> (+19.12%)	⬆️
unit	76.47% <ø> (ø)

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[dieselftw]

@gabriellsh @hugocostadev can I get a review on this? I feel like it's an important fix. Thanks! :)

[dieselftw]

@juliajforesti is there a problem with this fix? I'd appreciate some feedback! Thanks :)