fix: recognition of uppercase hex numbers for stylus mode

[mkslanc]

Issue #, if available: #4958

Description of changes:

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[codecov]

Codecov Report

Base: 85.99% // Head: 86.06% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (93b1b76) compared to base (0d86f93).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4962      +/-   ##
==========================================
+ Coverage   85.99%   86.06%   +0.06%     
==========================================
  Files         544      544              
  Lines       41469    41432      -37     
  Branches     6554     6537      -17     
==========================================
- Hits        35663    35659       -4     
+ Misses       5806     5773      -33     

Flag	Coverage Δ
unittests	86.06% <ø> (+0.06%)	⬆️

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

Impacted Files	Coverage Δ
src/mode/stylus_highlight_rules.js	100.00% <ø> (ø)
src/range.js	84.02% <0.00%> (-1.39%)	⬇️
src/edit_session.js	85.76% <0.00%> (ø)
src/keyboard/vim_test.js	98.61% <0.00%> (+<0.01%)	⬆️
src/layer/text.js	91.35% <0.00%> (+0.01%)	⬆️
src/edit_session/folding.js	75.42% <0.00%> (+0.09%)	⬆️
src/keyboard/vim.js	90.05% <0.00%> (+0.22%)	⬆️
src/editor.js	82.83% <0.00%> (+0.37%)	⬆️
src/edit_session/bracket_match.js	94.97% <0.00%> (+1.43%)	⬆️
src/mode/folding/xml.js	94.87% <0.00%> (+4.07%)	⬆️

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[andrewnester]

Thank you!