[Dataset] Update CT80 config

[gaotongxiao]

Based on #1552

[codecov]

Codecov Report

Base: 85.64% // Head: 85.83% // Increases project coverage by +0.19% 🎉

Coverage data is based on head (383c53a) compared to base (29107ef).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1555      +/-   ##
===========================================
+ Coverage    85.64%   85.83%   +0.19%     
===========================================
  Files          159      159              
  Lines         9931     9931              
  Branches      1378     1378              
===========================================
+ Hits          8505     8524      +19     
+ Misses        1178     1159      -19     
  Partials       248      248              

Flag	Coverage Δ
unittests	85.83% <ø> (+0.19%)	⬆️

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

Impacted Files	Coverage Δ
.../models/textdet/postprocessors/db_postprocessor.py	89.04% <0.00%> (-4.11%)	⬇️
...r/models/kie/postprocessors/sdmgr_postprocessor.py	91.17% <0.00%> (ø)
mmocr/datasets/transforms/textdet_transforms.py	91.79% <0.00%> (+0.26%)	⬆️
...cr/models/textdet/module_losses/pan_module_loss.py	96.79% <0.00%> (+7.69%)	⬆️
mmocr/datasets/transforms/textrecog_transforms.py	100.00% <0.00%> (+8.25%)	⬆️

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