make Combat Rate case insensitive

[horrible-little-slime]

Right now, numericModifier("Combat Rate") and numericModifier("combat rate") return different values when you're past the cap of 25, because we only are special casing the input "Combat Rate".

[codecov]

Codecov Report

Merging #717 (b663db9) into main (e5305d5) will not change coverage.
The diff coverage is 100.00%.

❗ Current head b663db9 differs from pull request most recent head 1636470. Consider uploading reports for the commit 1636470 to get more accurate results

@@            Coverage Diff            @@
##               main     #717   +/-   ##
=========================================
  Coverage     22.89%   22.89%           
  Complexity    10055    10055           
=========================================
  Files          1011     1011           
  Lines        158064   158064           
  Branches      34934    34934           
=========================================
  Hits          36185    36185           
  Misses       115492   115492           
  Partials       6387     6387           

Impacted Files	Coverage Δ
src/net/sourceforge/kolmafia/Modifiers.java	59.62% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update cd4ceed...1636470. Read the comment docs.