fixed the avatar sizes to match figma design

[Brazol]

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Linear: FLU-388

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main-design-system@213dfb6). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...lib/src/components/avatar/stream_avatar_group.dart	0.00%	5 Missing ⚠️
...r/lib/src/components/badge/stream_badge_count.dart	0.00%	3 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@                  Coverage Diff                  @@
##             main-design-system      #71   +/-   ##
=====================================================
  Coverage                      ?   33.32%           
=====================================================
  Files                         ?      115           
  Lines                         ?     3526           
  Branches                      ?        0           
=====================================================
  Hits                          ?     1175           
  Misses                        ?     2351           
  Partials                      ?        0           

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