Update nz-autocomplete.component.ts

[elvisqi]

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?

显示出多余的空行

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #1384 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1384   +/-   ##
=======================================
  Coverage   97.03%   97.03%           
=======================================
  Files         196      196           
  Lines        8339     8339           
  Branches     1102     1102           
=======================================
  Hits         8092     8092           
  Misses         31       31           
  Partials      216      216

Impacted Files	Coverage Δ
...ponents/auto-complete/nz-autocomplete.component.ts	96.59% <ø> (ø)	⬆️

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[hsuanxyz]

@elvisqi 感谢你的PR，这里可以将整个 :host 选择器删除。