Fix (base.py): fix with_xxx_attributes in base detector

[ZwwWayne]

Fix #3444

[codecov]

Codecov Report

Merging #3567 into master will increase coverage by 0.06%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #3567      +/-   ##
==========================================
+ Coverage   59.04%   59.10%   +0.06%     
==========================================
  Files         205      205              
  Lines       13731    13731              
  Branches     2315     2315              
==========================================
+ Hits         8107     8116       +9     
+ Misses       5248     5239       -9     
  Partials      376      376              

Flag	Coverage Δ
#unittests	59.10% <66.66%> (+0.06%)	⬆️

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Impacted Files	Coverage Δ
mmdet/models/detectors/base.py	51.14% <66.66%> (ø)
mmdet/models/dense_heads/corner_head.py	76.04% <0.00%> (+1.94%)	⬆️
mmdet/models/detectors/cornernet.py	100.00% <0.00%> (+5.12%)	⬆️

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