Fix speaker video view from video platform

[lcduong]

This PR closes/references issue speaker view in video component. It does so by return avartar_source and avartar_license as text

How has this been tested?

Checklist

• [ ] I have added tests to cover my changes.

Summary by Sourcery

This pull request addresses an issue with the speaker video view in the video component by modifying the return values of avatar_source and avatar_license to be text.

• Bug Fixes:
  • Fixed the speaker video view issue by returning avatar_source and avatar_license as text instead of calling them with event parameter.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request addresses an issue with the speaker view in the video component by modifying the return values of the get_avatar_source and get_avatar_license methods in the speaker.py serializer. The changes ensure that these methods return text values instead of calling them with an event parameter.

File-Level Changes

Files	Changes
src/pretalx/api/serializers/speaker.py	Updated methods to return avatar source and license as text values without event parameter.

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