Fix: Menus: "Save Menu" header button misaligned with "Menu Name" field on small screens

[hbhalodia]

Trac ticket: https://core.trac.wordpress.org/ticket/65665

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[github-actions]

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[github-actions]

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Props hbhalodia, deepakprajapati, dhruvang21.

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[deepakpra]

@hbhalodia Thanks for the PR, the code changes LGTM.
I noticed that this PR includes several older and unrelated commits from WordPress:trunk.

[hbhalodia]

noticed that this PR includes several older and unrelated commits from WordPress:trunk.

@deepakpra This is fixed.

[dhruvang21]

@hbhalodia I tested the patch using WP Playground, and it works fine.