Customize: Fix regression in ability to hide fields for advanced menu...

Customize: Fix regression in ability to hide fields for advanced menu properties in nav menu item controls.

Props westonruter, celloexpressions.
See #34391.
Fixes #38952.

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git-svn-id: https://core.svn.wordpress.org/trunk@39318 1a063a9b-81f0-0310-95a4-ce76da25c4cd