Correct topdown aic configs

[dreamPoet]

Correct val_pipeline in aic datasets configs.

[CLAassistant]

All committers have signed the CLA.

[jin-s13]

Please also check & correct all the similar issues. Replace all valid_ with val_.

[codecov]

Codecov Report

Merging #340 (6a1fc48) into master (0765325) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #340   +/-   ##
=======================================
  Coverage   83.85%   83.85%           
=======================================
  Files         115      115           
  Lines        7257     7257           
  Branches     1151     1151           
=======================================
  Hits         6085     6085           
  Misses        955      955           
  Partials      217      217           

Flag	Coverage Δ
unittests	83.85% <100.00%> (ø)

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

Impacted Files	Coverage Δ
mmpose/core/evaluation/top_down_eval.py	84.44% <100.00%> (ø)

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[innerlee]

thanks!