Improve about/shortcuts stories by passing in onClose as a prop.

[tmeasday]

Issue: as discussed in this comment:
07df8ba#r32112836

What I did

Re-purified about and settings screen components

[codecov]

Codecov Report

Merging #5425 into next will not change coverage.
The diff coverage is 63.63%.

@@          Coverage Diff          @@
##            next   #5425   +/-   ##
=====================================
  Coverage   31.2%   31.2%           
=====================================
  Files        625     625           
  Lines       9187    9187           
  Branches    1281    1281           
=====================================
  Hits        2867    2867           
  Misses      5680    5680           
  Partials     640     640

Impacted Files	Coverage Δ
lib/ui/src/settings/shortcuts_page.js	0% <0%> (ø)	⬆️
lib/ui/src/settings/about_page.js	12.5% <0%> (-1.79%)	⬇️
lib/ui/src/settings/shortcuts.stories.js	100% <100%> (ø)	⬆️
lib/ui/src/settings/about.stories.js	100% <100%> (ø)	⬆️
lib/ui/src/settings/shortcuts.js	92.3% <50%> (+1.74%)	⬆️
lib/ui/src/settings/about.js	75% <50%> (+5%)	⬆️

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