fix(module:select): fix single selection choice content display issues

[hungtcs]

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: #3710

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #3802 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3802   +/-   ##
=======================================
  Coverage   95.35%   95.35%           
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  Files         706      706           
  Lines       14558    14558           
  Branches     1923     1923           
=======================================
  Hits        13882    13882           
  Misses        246      246           
  Partials      430      430

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[vthinkxie]

thanks for your pr!
all index.less in style folder are synced from antd react version, we should not change it

[hungtcs]

@vthinkxie It looks like that the html template for angular is different from react:

<!-- Angular -->
<div class="ant-select-selection-selected-value" style="display: block; opacity: 1;">
  <div class="ant-select-selection__choice__content ">the long text content</div>
</div>
<!-- React -->
<div class="ant-select-selection-selected-value" style="display: block; opacity: 1;">the long text content</div>

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[vthinkxie]

LGTM