fix max_coordinate in multiclass_nms_rotated

[liuyanyi]

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Motivation

fix max_coordinate in multiclass_nms_rotated

Modification

Please briefly describe what modification is made in this PR.

BC-breaking (Optional)

Does the modification introduce changes that break the back-compatibility of the downstream repos?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Merging #346 (8b09126) into main (ff6d407) will decrease coverage by 1.07%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #346      +/-   ##
==========================================
- Coverage   31.94%   30.86%   -1.08%     
==========================================
  Files         113      119       +6     
  Lines        7394     7934     +540     
  Branches     1135     1220      +85     
==========================================
+ Hits         2362     2449      +87     
- Misses       4931     5384     +453     
  Partials      101      101              

Flag	Coverage Δ
unittests	30.84% <0.00%> (-1.08%)	⬇️

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

Impacted Files	Coverage Δ
mmrotate/core/post_processing/bbox_nms_rotated.py	6.15% <0.00%> (ø)
mmrotate/models/losses/__init__.py	100.00% <0.00%> (ø)
mmrotate/core/bbox/coder/__init__.py	100.00% <0.00%> (ø)
mmrotate/models/detectors/__init__.py	100.00% <0.00%> (ø)
mmrotate/models/dense_heads/__init__.py	100.00% <0.00%> (ø)
...ate/models/dense_heads/rotated_anchor_free_head.py	22.58% <0.00%> (ø)
mmrotate/models/dense_heads/rotated_fcos_head.py	10.04% <0.00%> (ø)
...rotate/models/dense_heads/csl_rotated_fcos_head.py	13.88% <0.00%> (ø)
mmrotate/models/detectors/rotated_fcos.py	83.33% <0.00%> (ø)
mmrotate/models/losses/rotated_iou_loss.py	25.00% <0.00%> (ø)
... and 1 more

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[zytx121]

LGTM