Fixed wrong import for bioviz

[pariterre]

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This change is 

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 77.17%. Comparing base (5bff765) to head (a37b19c).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
bioptim/models/biorbd/viewer_bioviz.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1038   +/-   ##
=======================================
  Coverage   77.17%   77.17%           
=======================================
  Files         184      184           
  Lines       20521    20521           
=======================================
  Hits        15837    15837           
  Misses       4684     4684           

Flag	Coverage Δ
unittests	77.17% <0.00%> (ø)

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