breaking(Dropdown): clean searchQuery after selection in multiple search Dropdown

[layershifter]

Fixes #1829.
Rel #1795.
Rel #2048.
Rel #2109.

<Dropdown search multiple />

Type	Behaviour
Before	Search query was kept after item selection
After	Search query will be cleared after selection, if you want to keep previous behaviour, use controlled components and handle searchQuery manually

In #1795 we changed the behaviour of searchQuery, we don't clear it after selection in multiple search Dropdown. This PR reverts this change because:

• this behaviour isn't intuitive for users and we got claims about it
• feat(Dropdown): add searchQuery prop #2109 added ability to control searchQuery

[codecov-io]

Codecov Report

Merging #2112 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #2112   +/-   ##
=======================================
  Coverage   99.76%   99.76%           
=======================================
  Files         150      150           
  Lines        2596     2596           
=======================================
  Hits         2590     2590           
  Misses          6        6

Impacted Files	Coverage Δ
src/modules/Dropdown/Dropdown.js	100% <100%> (ø)	⬆️

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[levithomason]

Thank you sir!

[levithomason]

Released in semantic-ui-react@0.74.0