Fix issue sidebar menus having an infinite height

[jamesorlakin]

A partial revert of #10216, yet still an attempt at fixing #10218. This PR sets the max-height property to a different selector so it fixes the assignee menu too.

Before:

After:

I'm willing to create a backport for v1.11, as it is quite noticetable on my production instance! 😄

[codecov-io]

Codecov Report

Merging #10239 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10239      +/-   ##
==========================================
- Coverage   43.68%   43.67%   -0.02%     
==========================================
  Files         582      582              
  Lines       80048    80048              
==========================================
- Hits        34966    34957       -9     
- Misses      40747    40754       +7     
- Partials     4335     4337       +2

Impacted Files	Coverage Δ
modules/indexer/stats/db.go	55.17% <0%> (-10.35%)	⬇️
services/pull/temp_repo.go	29.05% <0%> (-2.57%)	⬇️
services/pull/patch.go	60.37% <0%> (-2.52%)	⬇️
services/pull/check.go	32.92% <0%> (-2.44%)	⬇️
modules/queue/workerpool.go	50.17% <0%> (ø)	⬆️
modules/log/event.go	65.64% <0%> (+1.02%)	⬆️
modules/process/manager.go	78.31% <0%> (+3.61%)	⬆️

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[lafriks]

Please send backport

[jamesorlakin]

Already done ;). I forgot to set the title properly though! #10240