fix CheckCommand generation for webhooks

[mmta]

Resolves #397

[codecov-io]

Codecov Report

Merging #399 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master    #399      +/-   ##
=========================================
- Coverage    3.46%   3.46%   -0.01%     
=========================================
  Files         123     123              
  Lines       10858   10861       +3     
=========================================
  Hits          376     376              
- Misses      10432   10435       +3     
  Partials       50      50

Impacted Files	Coverage Δ
pkg/plugin/check_command.go	0% <0%> (ø)	⬆️

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[tamalsaha]

Thanks @mmta !