fix(module:date-picker): remove unsafe style

[ParsaArvanehPA]

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?

Fixed inline styles causing CSP errors.

Issue Number: #8425

What is the new behavior?

Described above.

Does this PR introduce a breaking change?

[ ] Yes
[✔] No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.61%. Comparing base (2576612) to head (7235666).
Report is 29 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #8458    +/-   ##
========================================
  Coverage   91.60%   91.61%            
========================================
  Files         519      530    +11     
  Lines       18074    18391   +317     
  Branches     2848     2813    -35     
========================================
+ Hits        16557    16848   +291     
- Misses       1218     1226     +8     
- Partials      299      317    +18     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[HyperLife1119]

LGTM