fix(Dropdown): fix Dropdown ArrowLeft keydown behavior for multiple variants

[silviuaavram]

fixes #1129

It was broken when the user was (shift-)tabbing from the last selected item. If the last item was already marked as active, then ArrowLeft from SearchInput would not re-focus it, due to the logic in DropdownSelectedItem:

if (!prevProps.active && this.props.active) {

I don't like the solution chosen but I cannot think of anything else less intrusive than this.

[codecov]

Codecov Report

Merging #1564 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1564      +/-   ##
==========================================
+ Coverage   71.65%   71.66%   +0.01%     
==========================================
  Files         848      848              
  Lines        6907     6910       +3     
  Branches     1982     1983       +1     
==========================================
+ Hits         4949     4952       +3     
  Misses       1952     1952              
  Partials        6        6

Impacted Files	Coverage Δ
...ackages/react/src/components/Dropdown/Dropdown.tsx	88.6% <100%> (+0.08%)	⬆️

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[jurokapsiar]

please add changelog