core: fix sources get icon naming

[BeryJu]

Details

Just a small name change

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Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)
• The translation files have been updated (make i18n-extract)

If applicable

• The documentation has been updated
• The documentation has been formatted (make website)

[netlify]

✅ Deploy Preview for authentik-storybook canceled.

Name	Link
🔨 Latest commit	538b1bc
🔍 Latest deploy log	https://app.netlify.com/sites/authentik-storybook/deploys/655d13804e273b0008fbb149

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (39458a1) 92.61% compared to head (538b1bc) 50.82%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
authentik/sources/oauth/models.py	33.33%	2 Missing ⚠️
authentik/sources/plex/models.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #7674       +/-   ##
===========================================
- Coverage   92.61%   50.82%   -41.80%     
===========================================
  Files         588      588               
  Lines       29140    29140               
===========================================
- Hits        26989    14809    -12180     
- Misses       2151    14331    +12180     

Flag	Coverage Δ
e2e	49.19% <42.85%> (-1.50%)	⬇️
integration	25.93% <28.57%> (ø)
unit	?

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