fix(module:date-picker): open the panel wrongly in IE11

[wenqi73]

Fixes #5562

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:

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 #5643 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5643      +/-   ##
==========================================
+ Coverage   90.06%   90.09%   +0.02%     
==========================================
  Files         455      455              
  Lines       13836    13835       -1     
  Branches     2262     2261       -1     
==========================================
+ Hits        12462    12464       +2     
+ Misses        848      847       -1     
+ Partials      526      524       -2     

Impacted Files	Coverage Δ
components/date-picker/picker.component.ts	96.57% <100.00%> (+0.62%)	⬆️
components/date-picker/testing/util.ts	100.00% <100.00%> (ø)
components/core/util/text-measure.ts	91.30% <0.00%> (+1.73%)	⬆️

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