Update layer-types.js

[Heegiiny]

No description provided.

[mcous]

Thanks for the contribution @Heegiiny! Would you mind adding test cases for your changes to the file name test fixture? See packages/fixtures/gerber-filenames.json

[codecov]

Codecov Report

Merging #390 (62de154) into main (49c9a22) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #390   +/-   ##
=======================================
  Coverage   86.77%   86.77%           
=======================================
  Files          75       75           
  Lines        2405     2405           
  Branches       58       58           
=======================================
  Hits         2087     2087           
  Misses        316      316           
  Partials        2        2           

Impacted Files	Coverage Δ
packages/whats-that-gerber/lib/layer-types.js	100.00% <ø> (ø)

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