fix: 5591 - added a call to initialize rive

[monsieurtanuki]

What

• rive needs a call to initialize.

Fixes bug(s)

• Fixes: Minor "rive" bug to fix (import/initialize) #5591

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 6.96%. Comparing base (4d9c7fc) to head (9956cb2).
Report is 314 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/smooth_app/lib/main.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5592      +/-   ##
==========================================
- Coverage     9.54%   6.96%   -2.59%     
==========================================
  Files          325     402      +77     
  Lines        16411   21206    +4795     
==========================================
- Hits          1567    1476      -91     
- Misses       14844   19730    +4886     

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[monsieurtanuki]

Thank you @teolemon for your review!