Formatting: Return early from `wp_kses_attr_check()` if the element is not in...

Formatting: Return early from `wp_kses_attr_check()` if the element is not in the list of allowed elements and attributes.

Props krynes, tristanleboss.
Fixes #48549.
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git-svn-id: https://core.svn.wordpress.org/trunk@46759 1a063a9b-81f0-0310-95a4-ce76da25c4cd