fix(module:input): incorrect background color in disabled state

[chenc041]

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?

incorrect background-color when using nzSuffix and nzAddOnAfter

Issue Number: #7247

Close: #7247

What is the new behavior?

correct background-color

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #7250 (17edbf7) into master (f40aad9) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7250      +/-   ##
==========================================
- Coverage   91.72%   91.72%   -0.01%     
==========================================
  Files         486      486              
  Lines       15918    15950      +32     
  Branches     2588     2591       +3     
==========================================
+ Hits        14601    14630      +29     
- Misses       1004     1010       +6     
+ Partials      313      310       -3     

Impacted Files	Coverage Δ
components/input/input-group.component.ts	98.27% <ø> (ø)
components/table/src/table/tr-measure.component.ts	86.36% <0.00%> (-13.64%)	⬇️
components/table/src/table/tbody.component.ts	88.88% <0.00%> (-11.12%)	⬇️
...ts/table/src/table/table-inner-scroll.component.ts	79.41% <0.00%> (-4.42%)	⬇️
components/collapse/collapse.component.ts	94.59% <0.00%> (-0.41%)	⬇️
components/typography/text-edit.component.ts	95.45% <0.00%> (-0.11%)	⬇️
components/slider/slider.component.ts	92.27% <0.00%> (+0.02%)	⬆️
components/collapse/collapse-panel.component.ts	92.85% <0.00%> (+0.26%)	⬆️
components/table/src/cell/th-addon.component.ts	90.12% <0.00%> (+0.37%)	⬆️
components/select/select.component.ts	90.90% <0.00%> (+0.71%)	⬆️
... and 4 more

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[simplejason]

LGTM