Fixed using single shape annotation mode with multiple labels

[bsekachev]

Motivation and context

How has this been tested?

Checklist

• I submit my changes into the develop branch
• I have created a changelog fragment
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (see GitHub docs)
• I have increased versions of npm packages if it is necessary
  (cvat-canvas,
  cvat-core,
  cvat-data and
  cvat-ui)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.

[codecov]

Codecov Report

Merging #7606 (b6a96c7) into develop (cd5cd44) will increase coverage by 0.02%.
Report is 6 commits behind head on develop.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7606      +/-   ##
===========================================
+ Coverage    83.44%   83.46%   +0.02%     
===========================================
  Files          373      373              
  Lines        39756    39739      -17     
  Branches      3741     3741              
===========================================
- Hits         33175    33169       -6     
+ Misses        6581     6570      -11     

Components	Coverage Δ
cvat-ui	79.28% <ø> (+0.04%)	⬆️
cvat-server	87.32% <ø> (+<0.01%)	⬆️