fix: filter classes in object count for distance

[pawel-kotowski]

Category

• Perception
  • Detection
  • Tracking
  • Prediction
  • Classification
• Sensing
• Other

What

Minor fix to show only bars of classes listed in class_names (in object counts by distance plot).

Type of change

• New feature
• [ x] Bug fix
• Breaking change
• Refactoring
• Change code style
• Update test
• Update document
• Chore

Test performed

Generation of plots before and after change.

There are cars, pedestrians and trucks in tested scene and plots are generated with class_names = ["car", "pedestrian", "bicycle", "bus"]

Plot generated without filtering:

• truck is also included despite not being listed in class_names
• bicycle and bus class is visible with no objects. This would be ok, but if we put bus or bicycle as first or last in class_names list, then they are not visible on plot. So due to inconsistent behaviour this is also changed and objects with count>0 are not visible.
  

Plot generated with filtering:

• test.sensing_lsim

• test.perception_lsim

Reference

Notes for reviewer

[ktro2828]

@pawel-kotowski Thanks for your PR. It looks good to me.

@Shin-kyoto Do you have any comments or suggestions?

[Shin-kyoto]

LGTM