Fix broken .comment > .content caused by #13457

[CirnoT]

I have no idea how it happened but somehow I completely missed the fact that .comment > .content does not refer to actual comments only but also to all other boxes on comment timeline.

Before:

After:

[codecov-io]

Codecov Report

Merging #13482 (bf338d4) into master (77e5081) will increase coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #13482      +/-   ##
==========================================
+ Coverage   42.05%   42.19%   +0.13%     
==========================================
  Files         694      694              
  Lines       76334    76334              
==========================================
+ Hits        32105    32210     +105     
+ Misses      38971    38855     -116     
- Partials     5258     5269      +11     

Impacted Files	Coverage Δ
models/gpg_key.go	53.33% <0.00%> (-0.58%)	⬇️
models/error.go	36.06% <0.00%> (+0.83%)	⬆️
models/notification.go	66.66% <0.00%> (+0.90%)	⬆️
services/pull/pull.go	41.27% <0.00%> (+0.98%)	⬆️
services/pull/check.go	51.09% <0.00%> (+2.18%)	⬆️
modules/process/manager.go	75.00% <0.00%> (+2.50%)	⬆️
modules/notification/notification.go	86.60% <0.00%> (+2.67%)	⬆️
modules/notification/base/null.go	77.14% <0.00%> (+2.85%)	⬆️
modules/git/commit.go	53.61% <0.00%> (+3.94%)	⬆️
modules/notification/mail/mail.go	39.08% <0.00%> (+5.74%)	⬆️
... and 2 more

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