Story Hierarchy - initial state bug fix

[igor-dv]

Issue: #151

What I did

I've added componentWillReceiveProps to the stories_tree/index.js that will recalculate the selected nodes according to the provided selected hierarchy.

How to test

run cra-kitchen-sink

[codecov]

Codecov Report

Merging #1401 into release/3.2 will increase coverage by 0.07%.
The diff coverage is 100%.

@@              Coverage Diff               @@
##           release/3.2   #1401      +/-   ##
==============================================
+ Coverage        15.82%   15.9%   +0.07%     
==============================================
  Files              237     237              
  Lines             5043    5050       +7     
  Branches           625     619       -6     
==============================================
+ Hits               798     803       +5     
- Misses            3725    3729       +4     
+ Partials           520     518       -2

Impacted Files	Coverage Δ
...les/ui/components/left_panel/stories_tree/index.js	100% <100%> (ø)	⬆️
app/react-native/src/preview/story_kind.js	0% <0%> (ø)	⬆️
app/react/src/client/preview/error_display.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/hierarchy.js	47.16% <0%> (ø)	⬆️
lib/ui/src/libs/key_events.js	23.25% <0%> (ø)	⬆️
lib/ui/src/modules/shortcuts/actions/shortcuts.js	6.25% <0%> (ø)	⬆️
...ponents/left_panel/stories_tree/tree_decorators.js	39.02% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/layout.js	12.5% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/filters.js	41.66% <0%> (ø)	⬆️
addons/knobs/src/react/WrapStory.js	11.11% <0%> (ø)	⬆️
... and 13 more

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[shilman]

if(!deepEquals(currentHierarchy, nextHierarchy)) {
   const selectedNodes ...
}

[shilman]

see suggestion above @igor-dv