fix(module:date-picker): arrow in wrong position for RTL direction

[luckyship]

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: #7373
close: #7373

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #7690 (0ead98d) into master (ee4872e) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head 0ead98d differs from pull request most recent head 395fd4b. Consider uploading reports for the commit 395fd4b to get more accurate results

@@            Coverage Diff             @@
##           master    #7690      +/-   ##
==========================================
- Coverage   92.03%   92.01%   -0.03%     
==========================================
  Files         502      502              
  Lines       16757    16759       +2     
  Branches     2635     2636       +1     
==========================================
- Hits        15423    15421       -2     
- Misses       1064     1068       +4     
  Partials      270      270              

Impacted Files	Coverage Δ
...mponents/date-picker/date-range-popup.component.ts	95.21% <100.00%> (+0.05%)	⬆️
components/table/src/table-data.service.ts	80.32% <0.00%> (-4.92%)	⬇️
components/core/util/text-measure.ts	92.10% <0.00%> (-0.88%)	⬇️
components/tabs/tab-nav-bar.component.ts	87.23% <0.00%> (-0.71%)	⬇️
components/date-picker/date-picker.component.ts	94.42% <0.00%> (+0.61%)	⬆️

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[wenqi73]

[luckyship]

@wenqi73 thanks, i have updated style to fix this.

[wenqi73]

LGTM