Add custom rating colours for dark mode;

[Ninjaclasher]

Part of #2035.

After:

[codecov-commenter]

Codecov Report

Base: 46.79% // Head: 46.79% // No change to project coverage 👍

Coverage data is based on head (da739a1) compared to base (ccb2964).
Patch has no changes to coverable lines.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2150   +/-   ##
=======================================
  Coverage   46.79%   46.79%           
=======================================
  Files         239      239           
  Lines       13191    13191           
=======================================
  Hits         6173     6173           
  Misses       7018     7018           

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[kiritofeng]

LGTM, thanks!