fix(module:select): trigger keyboard on ios (#1653)

[danielszenasi]

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?

Keyboard does't show up on ios

Issue Number: N/A

What is the new behavior?

Keyboard show up on ios

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #1751 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1751      +/-   ##
==========================================
- Coverage   96.05%   96.05%   -0.01%     
==========================================
  Files         466      466              
  Lines       11146    11144       -2     
  Branches     1456     1455       -1     
==========================================
- Hits        10706    10704       -2     
  Misses        127      127              
  Partials      313      313

Impacted Files	Coverage Δ
...mponents/select/nz-select-top-control.component.ts	97.67% <ø> (-0.06%)	⬇️

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