refactor(examples): remove unused Label from dialog close button example

[YogeshK34]

Summary

This PR removes an unnecessary <Label> from the Dialog Close Button example in
apps/v4/registry/new-york-v4/example/dialog-close-button.tsx.

The input inside the dialog is readOnly and not part of a form, so the label does not provide any additional accessibility or functional benefit. The dialog title (“Share link”) already provides sufficient context for screen readers.

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Why

1. The <Label> was not referenced visually or semantically.
2. It does not improve accessibility in this scenario.
3. It adds noise to the example and may confuse developers learning the component.
4. Removing it simplifies the example without changing behavior.

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What’s changed

// Removed:
// <Label htmlFor="link" className="sr-only">Link</Label>

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No other logic or styles were modified.

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