fix(module: carousel): fix mousemove action when carousel only has tw…

[nuonuoge]

…o carouselslide

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
[x] No

Other information

[codecov]

Codecov Report

Merging #56 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
+ Coverage    85.9%   85.92%   +0.02%     
==========================================
  Files         209      209              
  Lines        6897     6894       -3     
  Branches      977      974       -3     
==========================================
- Hits         5925     5924       -1     
  Misses        559      559              
+ Partials      413      411       -2

Impacted Files	Coverage Δ
components/carousel/carousel.component.ts	67.53% <ø> (+0.37%)	⬆️

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