Formatting: Ensure that wp_filter_object_list() will return an array when...

Formatting: Ensure that wp_filter_object_list() will return an array when being passed an object with magic methods.

Fixes #50095.

Props johnjamesjacoby.

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git-svn-id: https://core.svn.wordpress.org/trunk@48182 1a063a9b-81f0-0310-95a4-ce76da25c4cd