[Fix]: create_gt_database of nuscenes

[meng-zha]

• Fix the bug on the commit [Fix]: create_gt_database #211 for the create_gt_database in nuscenes

[meng-zha]

It will be appreciated if you can test the create_data.py for all datasets. I'm sorry I have made a small bugs in commit #221.

[codecov]

Codecov Report

Merging #221 (c0b4468) into master (94f64e3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #221   +/-   ##
=======================================
  Coverage   49.93%   49.93%           
=======================================
  Files         172      172           
  Lines       11556    11556           
  Branches     1801     1801           
=======================================
  Hits         5771     5771           
  Misses       5411     5411           
  Partials      374      374           

Flag	Coverage Δ
unittests	49.93% <ø> (ø)

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