Fix init_cfg in resnet backbone

[puhsu]

Here is the quick fix for resnet backbone init_cfg option I talked about in #695

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[codecov]

Codecov Report

Merging #697 (c4b458e) into master (f5be6e2) will not change coverage.
The diff coverage is 100.00%.

❗ Current head c4b458e differs from pull request most recent head ed0123e. Consider uploading reports for the commit ed0123e to get more accurate results

@@           Coverage Diff           @@
##           master     #697   +/-   ##
=======================================
  Coverage   85.18%   85.18%           
=======================================
  Files         105      105           
  Lines        5670     5670           
  Branches      923      923           
=======================================
  Hits         4830     4830           
  Misses        662      662           
  Partials      178      178           

Flag	Coverage Δ
unittests	85.16% <100.00%> (ø)

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Impacted Files	Coverage Δ
mmseg/models/backbones/resnet.py	99.28% <100.00%> (ø)

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[Junjun2016]

Thanks for your PR!