fix(module:rate): fix invalid type of nzCount in strictTemplates

[cipchk]

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?

[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

[zorro-bot]

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[codecov]

Codecov Report

Merging #6457 (5077d3d) into master (ec03c7f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6457   +/-   ##
=======================================
  Coverage   89.82%   89.82%           
=======================================
  Files         478      478           
  Lines       15314    15314           
  Branches     2475     2475           
=======================================
  Hits        13756    13756           
  Misses        940      940           
  Partials      618      618           

Impacted Files	Coverage Δ
components/rate/rate.component.ts	96.03% <ø> (ø)

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[wzhudev]

LGTM