move the global Mono check to the correct place

[filipw]

fixes #4489

[JoeRobich]

Thanks!

[codecov]

Codecov Report

Merging #4492 (78167cd) into master (6ee8745) will not change coverage.
The diff coverage is 20.00%.

@@           Coverage Diff           @@
##           master    #4492   +/-   ##
=======================================
  Coverage   68.69%   68.69%           
=======================================
  Files         109      109           
  Lines        4287     4287           
  Branches      742      742           
=======================================
  Hits         2945     2945           
- Misses       1140     1141    +1     
+ Partials      202      201    -1     

Flag	Coverage Δ
integration	52.26% <0.00%> (ø)
unit	85.81% <20.00%> (ø)

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Impacted Files	Coverage Δ
src/omnisharp/OmniSharpMonoResolver.ts	84.00% <20.00%> (ø)
src/features/semanticTokensProvider.ts	82.00% <0.00%> (-4.00%)	⬇️
src/features/diagnosticsProvider.ts	77.77% <0.00%> (+0.92%)	⬆️
src/features/codeLensProvider.ts	54.54% <0.00%> (+1.29%)	⬆️

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