Themes: Correct the logic for displaying a message in theme grid if a theme...

Themes: Correct the logic for displaying a message in theme grid if a theme update requires a higher version of PHP or WordPress.

This applies to the Themes screen fallback used when JS is turned off.

Follow-up to [48652].

See #48491.
Built from https://develop.svn.wordpress.org/trunk@48653


git-svn-id: https://core.svn.wordpress.org/trunk@48415 1a063a9b-81f0-0310-95a4-ce76da25c4cd