fix(module:select): exact match while searching should be active

[konossow]

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: #6812

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #6816 (6d88983) into master (ca2d3eb) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #6816   +/-   ##
=======================================
  Coverage   89.56%   89.56%           
=======================================
  Files         488      488           
  Lines       15779    15780    +1     
  Branches     2423     2423           
=======================================
+ Hits        14133    14134    +1     
  Misses       1005     1005           
  Partials      641      641           

Impacted Files	Coverage Δ
components/select/select.component.ts	87.26% <100.00%> (+0.04%)	⬆️
components/tabs/tab-nav-bar.component.ts	83.03% <0.00%> (ø)

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[simplejason]

LGTM