fix(schematics): fix template files suffix

[hsuanxyz]

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

[netlify]

Deploy preview for ng-zorro-master ready!

Built with commit e264b93

https://deploy-preview-3884--ng-zorro-master.netlify.com

[codecov]

Codecov Report

Merging #3884 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3884      +/-   ##
==========================================
- Coverage   95.24%   95.23%   -0.01%     
==========================================
  Files         726      726              
  Lines       14668    14665       -3     
  Branches     1910     1910              
==========================================
- Hits        13970    13966       -4     
  Misses        260      260              
- Partials      438      439       +1

Impacted Files	Coverage Δ
components/slider/nz-slider-marks.component.ts	89.74% <0%> (-0.74%)	⬇️
components/time-picker/time-holder.ts	96.57% <0%> (-0.69%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 13e4022...e264b93. Read the comment docs.

[vthinkxie]

LGTM