Add the checkbox quick button to the comment tool bar also

[a1012112796]

Just copy it from the WIKI tool bar :)

[codecov-commenter]

Codecov Report

Merging #12885 into master will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12885      +/-   ##
==========================================
+ Coverage   42.99%   43.08%   +0.09%     
==========================================
  Files         658      658              
  Lines       72448    72448              
==========================================
+ Hits        31148    31215      +67     
+ Misses      36260    36180      -80     
- Partials     5040     5053      +13     

Impacted Files	Coverage Δ
modules/process/manager.go	72.50% <0.00%> (-2.50%)	⬇️
services/pull/check.go	47.69% <0.00%> (-2.31%)	⬇️
modules/git/repo_commit.go	50.54% <0.00%> (-0.73%)	⬇️
models/error.go	34.81% <0.00%> (-0.52%)	⬇️
services/pull/pull.go	40.78% <0.00%> (ø)
modules/git/repo.go	46.70% <0.00%> (+0.50%)	⬆️
routers/repo/view.go	38.11% <0.00%> (+0.64%)	⬆️
services/mailer/mail.go	55.91% <0.00%> (+1.07%)	⬆️
modules/notification/notification.go	81.25% <0.00%> (+2.67%)	⬆️
models/unit.go	49.31% <0.00%> (+2.73%)	⬆️
... and 8 more

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[a1012112796]

Waiting review :)