Sergey Biryukov d772517fcc Database: Clean up the post_category column removed from DB schema for new installations in WordPress 2.8.
Its presence may conflict with `WP_Post::__get()`, which should generally fill the non-existent `post_category` property, but is not triggered if the column exists in the database.

Follow-up to [10895].

Props leogermani, davidbaumwald, hellofromTonya.
Fixes #51288.
Built from https://develop.svn.wordpress.org/trunk@49572


git-svn-id: http://core.svn.wordpress.org/trunk@49310 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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