fix(module:color-picker): avoid emitted twice nzOnChange event

[Nicoss54]

PR Checklist

Please check if your PR fulfills the following requirements:

• [X] 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?

When we change the color of color-picket nzOnChange event is emitted twice

Issue Number: #8502

What is the new behavior?

When we change the color of color picker nzOnChange event is emitted only one time

Does this PR introduce a breaking change?

[ ] Yes
[X] No

Other information

[zorro-bot[bot]]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.58%. Comparing base (81ef077) to head (08295d2).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8530   +/-   ##
=======================================
  Coverage   91.57%   91.58%           
=======================================
  Files         533      533           
  Lines       18336    18338    +2     
  Branches     2801     2801           
=======================================
+ Hits        16792    16794    +2     
  Misses       1226     1226           
  Partials      318      318           

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[OriginRing]

LGTM