bug #24874 [TwigBridge] Fixed the .form-check-input class in the bs4 templates (vudaltsov)

This PR was squashed before being merged into the 3.4 branch (closes #24874).

Discussion
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[TwigBridge] Fixed the .form-check-input class in the bs4 templates

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

If I am not mistaken, the `form-check-input` class should always be present in inputs of checkboxes and radios

Commits
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95a90e42 [TwigBridge] Fixed the .form-check-input class in the bs4 templates