fix(module:modal): modal cannot close after the host view destroyed

[hsuanxyz]

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
[x] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: #5128

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #5161 into master will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5161      +/-   ##
==========================================
- Coverage   91.34%   91.30%   -0.04%     
==========================================
  Files         548      548              
  Lines       13870    13876       +6     
  Branches     2093     2093              
==========================================
+ Hits        12669    12670       +1     
- Misses        708      713       +5     
  Partials      493      493              

Impacted Files	Coverage Δ
components/core/config/config.ts	100.00% <ø> (ø)
components/modal/utils.ts	100.00% <ø> (ø)
components/modal/modal-container.ts	87.27% <100.00%> (+0.23%)	⬆️
components/modal/modal-ref.ts	98.90% <100.00%> (+0.02%)	⬆️
components/modal/modal.component.ts	96.87% <100.00%> (+0.03%)	⬆️
components/table/src/table/tbody.component.ts	85.71% <0.00%> (-14.29%)	⬇️
components/table/src/table/tr-measure.component.ts	86.95% <0.00%> (-13.05%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c2b68dd...d58e844. Read the comment docs.