fix(module:button): fix nzOkDanger confirm btn and demo

[yangjunhan]

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]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #6214 (e5d1104) into master (06108ca) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6214   +/-   ##
=======================================
  Coverage   89.83%   89.83%           
=======================================
  Files         477      477           
  Lines       15182    15167   -15     
  Branches     2295     2291    -4     
=======================================
- Hits        13638    13625   -13     
+ Misses        949      946    -3     
- Partials      595      596    +1     

Impacted Files	Coverage Δ
...ponents/modal/modal-confirm-container.component.ts	100.00% <ø> (ø)
components/time-picker/time-holder.ts	94.73% <0.00%> (-1.06%)	⬇️
components/tabs/tabset.component.ts	83.78% <0.00%> (-0.84%)	⬇️
components/tabs/tab.component.ts	92.59% <0.00%> (-0.27%)	⬇️
components/tabs/tab-link.directive.ts	50.00% <0.00%> (+12.50%)	⬆️

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[hsuanxyz]

LGTM