Weston Ruter d9cca27386 Customize: Fix nav_menu_item CSS classes array being incorrectly presented in input field as comma-delimited list.
Instead of using `Array.toString()` to serialize an array with comma delimiters, explicitly `join` the array using spaces instead. Also ensure that `xfn` is handled properly if it ever gets stored as an array. 

Props tyxla, westonruter.
Fixes #34111.

Built from https://develop.svn.wordpress.org/trunk@34788


git-svn-id: http://core.svn.wordpress.org/trunk@34753 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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