Fixed TrackerMIL one frame late

[klakhov]

Motivation and context

Before:

After:

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 #7399 (8a214b3) into develop (b5e1d19) will increase coverage by 0.21%.
Report is 1 commits behind head on develop.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7399      +/-   ##
===========================================
+ Coverage    83.25%   83.47%   +0.21%     
===========================================
  Files          373      373              
  Lines        39760    39760              
  Branches      3720     3720              
===========================================
+ Hits         33101    33188      +87     
+ Misses        6659     6572      -87     

Components	Coverage Δ
cvat-ui	79.36% <ø> (+0.45%)	⬆️
cvat-server	87.24% <ø> (ø)