Boone Gorges e9f6ee53bb Fix database schema update introduced in [30121].
The index must be manually dropped before `dbDelta()` can add the new index
without throwing a notice.

Fixes #22023.
Built from https://develop.svn.wordpress.org/trunk@30134


git-svn-id: http://core.svn.wordpress.org/trunk@30134 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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