fix voc recall iou_thr name error

[hhaAndroid]

Motivation

Variable name typo error in RPN recall evaluation code on VOC dataset.

resolve: #5186

Modification

replace iou_thr with iou_thrs.

[codecov]

Codecov Report

Merging #5195 (76c0019) into master (e8b9dc7) will increase coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #5195      +/-   ##
==========================================
+ Coverage   65.17%   65.20%   +0.02%     
==========================================
  Files         269      272       +3     
  Lines       20844    21078     +234     
  Branches     3500     3531      +31     
==========================================
+ Hits        13586    13743     +157     
- Misses       6492     6567      +75     
- Partials      766      768       +2     

Flag	Coverage Δ
unittests	65.16% <0.00%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
mmdet/datasets/voc.py	29.16% <0.00%> (ø)
mmdet/core/utils/misc.py	74.28% <0.00%> (-25.72%)	⬇️
mmdet/models/utils/gaussian_target.py	93.93% <0.00%> (-6.07%)	⬇️
mmdet/models/dense_heads/corner_head.py	69.62% <0.00%> (-1.12%)	⬇️
mmdet/models/necks/__init__.py	100.00% <0.00%> (ø)
mmdet/models/detectors/__init__.py	100.00% <0.00%> (ø)
mmdet/models/dense_heads/__init__.py	100.00% <0.00%> (ø)
mmdet/models/dense_heads/centernet_head.py	83.33% <0.00%> (ø)
mmdet/models/necks/ct_resnet_neck.py	65.21% <0.00%> (ø)
mmdet/models/detectors/centernet.py	26.82% <0.00%> (ø)
... and 1 more

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