Remove clip and -webkit-clip for block-library common.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); and -webkit-clip-path: inset(50%); rules from the packages/block-library/src/common.scss

Style attribute

Before	After

[github-actions]

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[github-actions]

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[afercia]

LGTM to me