fix(module:input): fix input disable style in reactive form

[vthinkxie]

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
close #1166

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #1167 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1167      +/-   ##
==========================================
- Coverage   96.76%   96.75%   -0.02%     
==========================================
  Files         184      184              
  Lines        7581     7583       +2     
  Branches      989      990       +1     
==========================================
+ Hits         7336     7337       +1     
- Misses         55       56       +1     
  Partials      190      190

Impacted Files	Coverage Δ
components/input/nz-input.directive.ts	96.29% <100%> (+0.14%)	⬆️
components/table/nz-table.component.ts	94.83% <0%> (-0.65%)	⬇️

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