Fix bug with missing token in latex folding

[mkslanc]

Issue #, if available: #5090

Description of changes:

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.10 🎉

Comparison is base (16a13ce) 86.20% compared to head (637dda4) 86.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5093      +/-   ##
==========================================
+ Coverage   86.20%   86.31%   +0.10%     
==========================================
  Files         548      549       +1     
  Lines       41704    41737      +33     
  Branches     6564     6568       +4     
==========================================
+ Hits        35953    36024      +71     
+ Misses       5751     5713      -38     

Flag	Coverage Δ
unittests	86.31% <100.00%> (+0.10%)	⬆️

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

Impacted Files	Coverage Δ
src/mode/folding/latex.js	56.04% <100.00%> (+41.75%)	⬆️
src/mode/folding/latex_test.js	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[InspiredGuy]

@mkslanc the fix looks good, but the coverage check for the patch failed. Could you please add a simple test for the function you modified, so this bug does not reappear again? I see we have tests for some other modes already.

[mkslanc]

Sure, added test similar to other folding tests