chore(ui): Cleanup message theme and usages

[renefloor]

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• I have signed the Stream CLA (required).
• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

This cleans the own and other message theme, because it's replaced by the core theme.

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.92%. Comparing base (ca78f2f) to head (bf44cf2).
⚠️ Report is 1 commits behind head on v10.0.0.

Files with missing lines	Patch %	Lines
...er/lib/src/message_input/stream_message_input.dart	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           v10.0.0    #2621      +/-   ##
===========================================
+ Coverage    65.77%   65.92%   +0.15%     
===========================================
  Files          428      421       -7     
  Lines        26105    25501     -604     
===========================================
- Hits         17171    16812     -359     
+ Misses        8934     8689     -245     

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