fix(module:date-picker): time picker panel not scroll at first time

[wenqi73]

blur event has not the relatedTarget in IE11, use focusout instead.

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• Tests for the changes have been added (for bug fixes / features)
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PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number:

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

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[codecov]

Codecov Report

Merging #6604 (c6001c3) into master (62e4bb6) will not change coverage.
The diff coverage is 100.00%.

❗ Current head c6001c3 differs from pull request most recent head bbd9d30. Consider uploading reports for the commit bbd9d30 to get more accurate results

@@           Coverage Diff           @@
##           master    #6604   +/-   ##
=======================================
  Coverage   89.93%   89.93%           
=======================================
  Files         481      481           
  Lines       15379    15379           
  Branches     2344     2344           
=======================================
  Hits        13831    13831           
  Misses        931      931           
  Partials      617      617           

Impacted Files	Coverage Δ
components/date-picker/picker.component.ts	91.76% <100.00%> (ø)

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