Fix BezierAnimation fraction issue

[Kyle-Ye]

Close #459

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 23.93%. Comparing base (a6d645e) to head (8ed136b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ftUICore/Animation/Animatable/AnimatablePair.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #463      +/-   ##
==========================================
+ Coverage   23.85%   23.93%   +0.08%     
==========================================
  Files         469      469              
  Lines       26609    26609              
==========================================
+ Hits         6347     6370      +23     
+ Misses      20262    20239      -23     

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