Cap new rating before computing new volatility

[Ninjaclasher]

This code should also have been moved in #840, but was missed. Currently, the new volatility is based on the uncapped new rating instead of the capped new rating.

Thanks to @int-y1 for finding this.

[codecov-commenter]

Codecov Report

Merging #1738 (afdd20d) into master (ba7b768) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #1738   +/-   ##
=======================================
  Coverage   46.50%   46.50%           
=======================================
  Files         220      220           
  Lines       12445    12445           
=======================================
  Hits         5787     5787           
  Misses       6658     6658           

Impacted Files	Coverage Δ
judge/ratings.py	18.18% <0.00%> (ø)

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