Align Text Vertically in Watch Expressions Panel Section

[zystvan]

Associated Issue: #2123

Summary of Changes

• Vertically align the text inside the Watch Expressions section in the panel
• Make the Watch Expressions section the same height as other sections by default

Test Plan

• It looks correct
• Devtools says that the section is the correct height
• Devtools shows that the text is centered

Screenshots/Videos

[jasonLaster]

Thanks @zystvan this looks great

[codecov-io]

Codecov Report

Merging #2142 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #2142   +/-   ##
======================================
  Coverage       0%      0%           
======================================
  Files          74      73    -1     
  Lines        2306    2290   -16     
======================================
+ Misses       2306    2290   -16

Impacted Files	Coverage Δ
src/components/Editor/Tabs.js	0% <ø> (ø)	✅
src/components/Editor/SearchBar.js	0% <ø> (ø)	✅
src/utils/parser.js	0% <ø> (ø)	✅
src/utils/utils.js	0% <ø> (ø)	✅
src/components/SecondaryPanes/Scopes.js	0% <ø> (ø)	✅
src/utils/object-inspector.js	0% <ø> (ø)	✅
src/components/shared/ObjectInspector.js	0% <ø> (ø)	✅
src/components/Editor/index.js	0% <ø> (ø)	✅
src/components/shared/Popover.js

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