fix(timepicker): fixed reset validation for ngModel

[SvetlanaMuravlova]

fix(timepicker): fixed reset validation for ngModel
close #6038

[github-actions]

Visit the preview URL for this PR (updated for commit cfc1226):

https://ngx-bootstrap-demo--pr6294-fix-timepicker-model-4kgsgr2m.web.app

_{(expires Tue, 21 Sep 2021 08:23:40 GMT)}

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[codecov]

Codecov Report

Merging #6294 (cfc1226) into development (cf5272f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           development    #6294   +/-   ##
============================================
  Coverage        77.27%   77.27%           
============================================
  Files              311      311           
  Lines            10714    10715    +1     
  Branches          2639     2639           
============================================
+ Hits              8279     8280    +1     
  Misses            2425     2425           
  Partials            10       10           

Impacted Files	Coverage Δ
src/timepicker/timepicker.component.ts	92.98% <100.00%> (+0.04%)	⬆️

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[cypress]

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Test summary

813 • 17 • 14 • 0

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Run details

Project	ngx-bootstrap
Status	Failed
Commit	3d2f58b ℹ️
Started	Sep 14, 2021 8:24 AM
Ended	Sep 14, 2021 8:37 AM
Duration	12:24 💡
OS	Linux Ubuntu - 20.04
Browser	Electron 87

View run in Cypress Dashboard ➡️

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Failures

	modals_service_page_spec.ts		4
1	Modals demo page testing suite: Service examples > Component modals with interceptor > when user clicks on "Close" button, triggers the interceptor and doesn't close the modal
2	Modals demo page testing suite: Service examples > Component modals with interceptor > when user clicks on "Yes" button, closes the modal
3	Modals demo page testing suite: Service examples > Component modals with interceptor > when user clicks on "No" button, doesn't close the modal
4	Modals demo page testing suite: Service examples > Events > when user closes modal by pressing ESC button then modal is closed and should be messages "onHide event has been fired" and "onHidden event has been fired"
	carousel_page_spec.ts		5
1	Carousel page testing suite > Slide changed event > example contains slides, indicators, left and right controls and "Slide has been switched: 0"
2	Carousel page testing suite > Slide changed event > when user click on left arrow - info changed to "Slide has been switched: 2"
3	Carousel page testing suite > Slide changed event > when user click on left arrow again - info changed to "Slide has been switched: 1"
4	Carousel page testing suite > Slide changed event > when user click on right arrow - info changed to "Slide has been switched: 1"
5	Carousel page testing suite > Slide changed event > when user click on right arrow again - info changed to "Slide has been switched: 2"
	pagination_page_spec.ts		1
1	Pagination demo page testing suite > Pager > example contains: 7 pages, Next - active, Previous - active, 4th page active
This comment includes only the first 10 test failures. See all 17 failures in the Cypress Dashboard.

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