fix(module:input): password icon's class name not applied

[ParsaArvanehPA]

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?

• [✔] 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?

The password icon in ant design's Input component has a ant-input-password-icon class name. Our implementation is kinda different than their approch, this makes it not possible for us to alsways set the ant-input-password-icon class name whenever a user is trying to use the password icon for the input's suffix(because we get it as a template). Given that the old style given to tag i did'nt work, that part is deleted and the ant-input-password-icon is given directly to the demo code, making future uses corrent.

Styles for the ant-input-password-icon class already exist.

What is the new behavior?

Does this PR introduce a breaking change?

• [ ] Yes
• [✔] No

Other information

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.15%. Comparing base (6311783) to head (f463a9d). Report is 4 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8768 +/- ## ======================================= Coverage 93.15% 93.15% ======================================= Files 538 538 Lines 18456 18457 +1 Branches 2816 2816 ======================================= + Hits 17192 17194 +2 + Misses 1226 1225 -1 Partials 38 38 ```

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