Fix lexer for ONTOLOGY parsing

[alkino]

Fix #175

[azure-pipelines]

✔️ 335bc74 -> Azure artifacts URL

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 67.85%. Comparing base (dc9d4c9) to head (d8d5640).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/nmodl/lex.lpp	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3091      +/-   ##
==========================================
- Coverage   67.85%   67.85%   -0.01%     
==========================================
  Files         572      572              
  Lines      104205   104210       +5     
==========================================
+ Hits        70709    70710       +1     
- Misses      33496    33500       +4     

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[sonarcloud]

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[azure-pipelines]

✔️ d8d5640 -> Azure artifacts URL