fix(module:carousel): fix if carousel out of sight stop carousel play.

[Guoyuanqiang]

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-mobile/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: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[codecov]

Codecov Report

Merging #382 into master will decrease coverage by 0.33%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #382      +/-   ##
==========================================
- Coverage   89.53%   89.19%   -0.34%     
==========================================
  Files         229      229              
  Lines        6906     6907       +1     
  Branches      564      564              
==========================================
- Hits         6183     6161      -22     
- Misses        558      575      +17     
- Partials      165      171       +6

Impacted Files	Coverage Δ
components/carousel/carousel.component.ts	68.11% <100%> (-8.97%)	⬇️

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