fix(module:carousel): throw error when changing rtl

[wenqi73]

close #6301

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?

[ ] 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

[zorro-bot]

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[codecov]

Codecov Report

Merging #6318 (dde8096) into master (a2cc9a7) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6318   +/-   ##
=======================================
  Coverage   89.91%   89.92%           
=======================================
  Files         478      478           
  Lines       15251    15250    -1     
  Branches     2318     2318           
=======================================
  Hits        13713    13713           
  Misses        924      924           
+ Partials      614      613    -1     

Impacted Files	Coverage Δ
components/carousel/carousel.component.ts	92.61% <ø> (-1.39%)	⬇️
components/time-picker/time-holder.ts	95.78% <0.00%> (+1.05%)	⬆️
components/core/util/text-measure.ts	91.30% <0.00%> (+1.73%)	⬆️

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[wzhudev]

Oh. I see why we need a direction property on strategy.