Coding Standards: Use Yoda conditions in some `wp-admin` files.

Props subrataemfluence, marcio-zebedeu, bookdude13, 1naveengiri, alishankhan.
Fixes #44365, #48455.
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git-svn-id: https://core.svn.wordpress.org/trunk@47018 1a063a9b-81f0-0310-95a4-ce76da25c4cd