fix(dropdown): fix dropdown inside click

[ghost]

• fix dropdown inside click
• fixed dropdown's and accordion's tests

Related to: #1933

PR Checklist

[OlegDubrovskyi]

Looks good.
Checked on Firefox, Chrome, IE11, Edge

[codecov]

Codecov Report

Merging #4609 into development will increase coverage by 0.29%.
The diff coverage is 81.81%.

@@               Coverage Diff               @@
##           development    #4609      +/-   ##
===============================================
+ Coverage        75.66%   75.96%   +0.29%     
===============================================
  Files              237      237              
  Lines             7336     7344       +8     
  Branches          1464     1466       +2     
===============================================
+ Hits              5551     5579      +28     
+ Misses            1379     1355      -24     
- Partials           406      410       +4

Impacted Files	Coverage Δ
src/dropdown/bs-dropdown-toggle.directive.ts	85.71% <100%> (+1.09%)	⬆️
src/dropdown/bs-dropdown.directive.ts	78.46% <75%> (+4.44%)	⬆️
src/dropdown/bs-dropdown-container.component.ts	70% <75%> (+44.07%)	⬆️
src/typeahead/typeahead.directive.ts	74.86% <0%> (+1.04%)	⬆️
src/utils/theme-provider.ts	65.21% <0%> (+8.69%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b2bd459...cd6226b. Read the comment docs.

[ludmilanesvitiy]

Tested, in FF 63.0 dropdown didn't close by outside click, in IE and Chrome works well. And looks like this PR need additional unit-tests.

[ghost]

@ludmilanesvitiy issue in Firefox was fixed, tests was added