feat(module: action_sheet): update testing coverage

[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?

[ ] Bugfix
[x] 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 #515 into master will increase coverage by 0.22%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #515      +/-   ##
=========================================
+ Coverage   88.58%   88.8%   +0.22%     
=========================================
  Files         269     268       -1     
  Lines        7514    7493      -21     
  Branches     1064    1058       -6     
=========================================
- Hits         6656    6654       -2     
+ Misses        433     417      -16     
+ Partials      425     422       -3

Impacted Files	Coverage Δ
...ents/action-sheet/action-sheet-options.provider.ts	100% <ø> (ø)	⬆️
components/action-sheet/public-api.ts	100% <ø> (ø)	⬆️
components/action-sheet/action-sheet.component.ts	97.05% <100%> (+16.5%)	⬆️

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