[Fix] Fix seg vis bug due to wrong parameter passing

[Xiangxu-0103]

This PR is used to fix the issue #1457

[codecov]

Codecov Report

Base: 49.57% // Head: 49.60% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (21438bd) compared to base (6ac2eed).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1858      +/-   ##
==========================================
+ Coverage   49.57%   49.60%   +0.03%     
==========================================
  Files         227      227              
  Lines       19707    19707              
  Branches     3207     3207              
==========================================
+ Hits         9769     9775       +6     
+ Misses       9351     9345       -6     
  Partials      587      587              

Flag	Coverage Δ
unittests	49.60% <0.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmdet3d/datasets/custom_3d_seg.py	67.29% <0.00%> (ø)
mmdet3d/datasets/pipelines/transforms_3d.py	88.25% <0.00%> (+0.85%)	⬆️

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