refactor(module:time-picker): place the clear button to outside of th…

[wilsoncook]

…e time picker panel

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[x] 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: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

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[codecov]

Codecov Report

Merging #2948 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2948      +/-   ##
==========================================
+ Coverage   97.36%   97.37%   +<.01%     
==========================================
  Files         526      526              
  Lines       11053    11052       -1     
  Branches      796      796              
==========================================
  Hits        10762    10762              
+ Misses        183      182       -1     
  Partials      108      108

Impacted Files	Coverage Δ
...ents/time-picker/nz-time-picker-panel.component.ts	92.39% <ø> (-0.7%)	⬇️
components/time-picker/nz-time-picker.component.ts	96.73% <100%> (+2.35%)	⬆️

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[vthinkxie]

LGTM