fix(module: tabbar):fix tintColor invalid(#418)

[Anberm]

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: #418

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #423 into master will decrease coverage by <.01%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #423      +/-   ##
==========================================
- Coverage   85.74%   85.74%   -0.01%     
==========================================
  Files         321      321              
  Lines        7718     7722       +4     
  Branches     1096     1097       +1     
==========================================
+ Hits         6618     6621       +3     
  Misses        665      665              
- Partials      435      436       +1

Impacted Files	Coverage Δ
components/tab-bar/tab-bar.component.ts	74.46% <75%> (+0.04%)	⬆️

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