Fix sidebar header wrapping

[Hypnosphi]

Issue: #1961

What I did

This partially reverts changes from #1769 while keeping the height alignment itself

How to test

Open cra-kitchen-sink and resize stories panel

[codecov]

Codecov Report

Merging #1962 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1962   +/-   ##
=======================================
  Coverage   21.38%   21.38%           
=======================================
  Files         262      262           
  Lines        5757     5757           
  Branches      697      691    -6     
=======================================
  Hits         1231     1231           
- Misses       3978     3995   +17     
+ Partials      548      531   -17

Impacted Files	Coverage Δ
.../ui/src/modules/ui/components/left_panel/header.js	29.62% <ø> (ø)	⬆️
lib/ui/src/modules/ui/routes.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/PropForm.js	8.51% <0%> (ø)	⬆️
app/react-native/src/preview/story_kind.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/PropField.js	10.86% <0%> (ø)	⬆️
addons/knobs/src/components/types/Color.js	8.1% <0%> (ø)	⬆️
addons/info/src/components/PropTable.js	21% <0%> (ø)	⬆️
...s/left_panel/stories_tree/tree_decorators_utils.js	45.23% <0%> (ø)	⬆️
lib/components/src/navigation/menu_link.js	0% <0%> (ø)	⬆️
addons/info/src/components/markdown/code.js	24.13% <0%> (ø)	⬆️
... and 12 more

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[danielduan]

I feel like text-overflow: ellipsis could be helpful so it wouldn't break into multiple lines?

[Hypnosphi]

I think it's actually better when it wraps as it did before: