.screen-reader-text CSS update for responsive-block-control style.scss

[mediaformat]

What?

Addresses part of #65954

Why?

The utility .screen-reader-text CSS is used in several places throughout the Gutenberg code base. In #65409 it came up that we should update all the areas to match the changing CSS rules proposed in #65409.

How?

Remove the unnecessary clip: rect(1px, 1px, 1px, 1px); rule from the packages/block-editor/src/components/responsive-block-control/style.scss

Style attribute

Before	After

[github-actions]

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Co-authored-by: afercia <[email protected]>

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[github-actions]

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[afercia]

Couple questions:

• I'm not sure why this uses a mixin in the first place. Introduced in Add experimental ResponsiveBlockControl component #16790 Cc @getdave
• Is ResponsiveBlockControl used anywhere at the moment?

[getdave]

Yes I think that component is probably due to be removed or deprecated. Not sure it's used.