[Performance] Improve tint and shade performance

[thadeucity]

Improve the performance of the tint and shade functions.

It is a tiny performance improvement and lib size reduction, but it does not degrade in any shape or form the quality of the code, so I believe it is a welcome change.

The improvement is achieved by exiting the parseToRgb function in the first IF that checks for HEX Colors, this way not testing or matching the default color unnecessarily.

[codecov[bot]]

Codecov Report

Merging #626 (8b70bb2) into main (275e646) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #626   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           89        89           
  Lines          860       860           
  Branches       323       323           
=========================================
  Hits           860       860           

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

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/color/shade.js	100.00% <100.00%> (ø)
src/color/tint.js	100.00% <100.00%> (ø)

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