[Fix] Num of tracklet does not align

[wqyin]

1. Fix the bug mentioned in #111 caused by the number of tracklet not aligning with the total number of persons during keypoints optimization
2. Update visualization in mview_mperson_end2end_estimator

[codecov-commenter]

Codecov Report

Merging #136 (65fddf5) into main (e1195e5) will decrease coverage by 0.09%. The diff coverage is 0.00%.

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@@            Coverage Diff             @@
##             main     #136      +/-   ##
==========================================
- Coverage   60.53%   60.44%   -0.09%     
==========================================
  Files         179      179              
  Lines       11253    11269      +16     
==========================================
  Hits         6812     6812              
- Misses       4441     4457      +16     

Flag	Coverage Δ
unittests	60.44% <0.00%> (-0.09%)	:arrow_down:

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Files Changed	Coverage Δ
...rmocap/transform/keypoints3d/optim/rm_duplicate.py	15.06% <0.00%> (-4.23%)	:arrow_down: