fix(module:date-picker): select date but nzDefaultOpenValue not work

[wenqi73]

Close #4454

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)
[ ] 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

[zorro-bot]

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[codecov]

Codecov Report

Merging #4490 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #4490      +/-   ##
==========================================
+ Coverage   92.02%   92.02%   +<.01%     
==========================================
  Files         517      517              
  Lines       10922    10923       +1     
  Branches     1981     1983       +2     
==========================================
+ Hits        10051    10052       +1     
  Misses        448      448              
  Partials      423      423

Impacted Files	Coverage Δ
components/core/time/candy-date.ts	84.94% <100%> (-0.32%)	⬇️
...ts/date-picker/lib/popups/inner-popup.component.ts	96% <100%> (+0.54%)	⬆️
components/time-picker/time-holder.ts	97.36% <0%> (ø)	⬆️

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[wzhudev]

LGTM