fix(module:modal): close modal itself before destructing by the angul…

[wilsoncook]

…ar's lifecycle

close #1663

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: #1663

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[wilsoncook]

Needs to pass through the testing.

[codecov]

Codecov Report

Merging #1769 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1769      +/-   ##
==========================================
+ Coverage   96.01%   96.02%   +<.01%     
==========================================
  Files         470      470              
  Lines       11424    11433       +9     
  Branches     1515     1516       +1     
==========================================
+ Hits        10969    10978       +9     
  Misses        131      131              
  Partials      324      324

Impacted Files	Coverage Δ
components/modal/nz-modal-control.service.ts	100% <100%> (ø)	⬆️
components/modal/nz-modal.component.ts	96.2% <100%> (+0.03%)	⬆️

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