[Fix] Fix bug in rotated_reppoints_head

[yangxue0827]

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Motivation

• Fix bug in rotated_reppoints_head [Bug] An error occurs in rotate_reppoints_head after modifying samples_per_gpu #232

Modification

all_overlaps_rotate_list = [None] * 4 -> all_overlaps_rotate_list = [None] * len(proposals_list)

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-commenter]

Codecov Report

Merging #246 (1ddb548) into dev (44b0aec) will increase coverage by 1.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev     #246      +/-   ##
==========================================
+ Coverage   28.30%   29.30%   +1.00%     
==========================================
  Files         108      113       +5     
  Lines        6967     7299     +332     
  Branches     1048     1110      +62     
==========================================
+ Hits         1972     2139     +167     
- Misses       4927     5084     +157     
- Partials       68       76       +8     

Flag	Coverage Δ
unittests	29.27% <0.00%> (+0.98%)	⬆️

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

Impacted Files	Coverage Δ
...otate/models/dense_heads/rotated_reppoints_head.py	6.82% <0.00%> (ø)
...oi_extractors/rotate_single_level_roi_extractor.py	23.07% <0.00%> (-0.37%)	⬇️
mmrotate/models/detectors/oriented_rcnn.py	41.17% <0.00%> (-42.16%)	⬇️
mmrotate/core/visualization/image.py	68.57% <0.00%> (-7.43%)	⬇️
...ate/models/roi_heads/oriented_standard_roi_head.py	16.66% <0.00%> (-0.32%)	⬇️
mmrotate/models/roi_heads/roi_trans_roi_head.py	11.88% <0.00%> (-0.26%)	⬇️
mmrotate/apis/train.py	0.00% <0.00%> (ø)
mmrotate/datasets/sar.py	100.00% <0.00%> (ø)
mmrotate/datasets/dota.py	15.78% <0.00%> (ø)
mmrotate/utils/__init__.py	100.00% <0.00%> (ø)
... and 13 more

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[zytx121]

LGTM

[liuyanyi]

LGTM