fix(module:datepicker): fixed opacity 0 on inline datepicker reopen

[nikolatasikj]

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?

#6897

Issue Number: 6897

What is the new behavior?

There is no animation for inline mode datepicker so it's not going invisible after re-opening

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Inline datepicker don't need to have animation because it's inline, nothing is opened through dropdown. Problems was in animation attached to inline mode so it's going to make opacity: 0 on inline datepicker after re-opening

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #6910 (69646ad) into master (f5d1de3) will not change coverage.
The diff coverage is n/a.

❗ Current head 69646ad differs from pull request most recent head 3a6ed64. Consider uploading reports for the commit 3a6ed64 to get more accurate results

@@           Coverage Diff           @@
##           master    #6910   +/-   ##
=======================================
  Coverage   89.50%   89.50%           
=======================================
  Files         489      489           
  Lines       15805    15805           
  Branches     2428     2428           
=======================================
  Hits        14147    14147           
  Misses       1016     1016           
  Partials      642      642           

Impacted Files	Coverage Δ
components/date-picker/date-picker.component.ts	90.97% <ø> (ø)
components/core/util/text-measure.ts	89.56% <0.00%> (-1.74%)	⬇️
components/tabs/tab-nav-bar.component.ts	83.03% <0.00%> (+0.70%)	⬆️

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[wenqi73]

    <ng-template
      cdkConnectedOverlay
      nzConnectedOverlay
      [cdkConnectedOverlayHasBackdrop]="nzBackdrop"
      [cdkConnectedOverlayOrigin]="origin"
      [cdkConnectedOverlayOpen]="realOpenState"
      [cdkConnectedOverlayPositions]="overlayPositions"
      [cdkConnectedOverlayTransformOriginOn]="'.ant-picker-wrapper'"
      (positionChange)="onPositionChange($event)"
      (detach)="close()"
      (overlayKeydown)="onOverlayKeydown($event)"
    >
      <div
        class="ant-picker-wrapper"
        [nzNoAnimation]="!!noAnimation?.nzNoAnimation"
        [@slideMotion]="'enter'"
        style="position: relative;"
      >
        <ng-container *ngTemplateOutlet="inlineMode"></ng-container>
      </div>
    </ng-template>

[wenqi73]

close #6897.
Thanks @nikolatasikj !