fix(module:segmented): fix index.less not imported in entry.less

[laggage]

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)
[x] 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?

My project import style of zorro as required

@import '~node_modules/ng-zorro-antd/tabs/style/entry.less';
@import '~node_modules/ng-zorro-antd/alert/style/entry.less';
@import '~node_modules/ng-zorro-antd/space/style/entry.less';

However, when it comes to import style for segmented, it breaks

/* works */
@import '~node_modules/ng-zorro-antd/segmented/style/index.less';

/* not works */
@import '~node_modules/ng-zorro-antd/segmented/style/entry.less';

Issue Number: N/A

What is the new behavior?

Below code snippet used to import style for segmented should works

@import '~node_modules/ng-zorro-antd/segmented/style/entry.less';

Does this PR introduce a breaking change?

[ ] Yes
[x] No

[zorro-bot]

This preview will be available after the AzureCI is passed.

[simplejason]

please make sure all tests work as except :)

[codecov]

Codecov Report

Merging #7624 (4f3bed0) into master (d14f20d) will not change coverage.
The diff coverage is n/a.

❗ Current head 4f3bed0 differs from pull request most recent head 5919314. Consider uploading reports for the commit 5919314 to get more accurate results

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  Misses       1065     1065           
  Partials      270      270           

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[laggage]

Rebased onto master, now all tests have passed

[simplejason]

LGTM