Fix lr to 8gpus in slowonly

[SuX97]

Fix the learning rate of slowonly to 8gpus default value.

[codecov]

Codecov Report

Merging #136 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #136   +/-   ##
=======================================
  Coverage   85.55%   85.55%           
=======================================
  Files          76       76           
  Lines        4155     4155           
  Branches      662      662           
=======================================
  Hits         3555     3555           
  Misses        494      494           
  Partials      106      106           

Flag	Coverage Δ
#unittests	85.55% <ø> (ø)

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Impacted Files	Coverage Δ
mmaction/models/backbones/resnet_tsm.py	95.08% <ø> (ø)

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