Fix AddGrid Transform

[yutong-xiang-97]

As part of the fix for Weekly Dependency Test

Tested locally

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 85.69%. Comparing base (2c0cfeb) to head (f0277a0).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lightly/transforms/add_grid_transform.py	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1830      +/-   ##
==========================================
- Coverage   85.71%   85.69%   -0.02%     
==========================================
  Files         164      164              
  Lines        6915     6921       +6     
==========================================
+ Hits         5927     5931       +4     
- Misses        988      990       +2     

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[liopeer]

LGTM!