fix(module:time-picker): ngModelChange not work

[wenqi73]

Fixes #4943

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?

[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: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #4944 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4944   +/-   ##
=======================================
  Coverage   91.53%   91.53%           
=======================================
  Files         535      535           
  Lines       13686    13686           
  Branches     2043     2043           
=======================================
  Hits        12528    12528           
  Misses        694      694           
  Partials      464      464           

Impacted Files	Coverage Δ
...ponents/time-picker/time-picker-panel.component.ts	93.60% <ø> (+0.75%)	⬆️
components/time-picker/time-picker.component.ts	93.81% <ø> (ø)
components/core/util/text-measure.ts	89.56% <0.00%> (-1.74%)	⬇️

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