Boone Gorges 974517d2bc Accept 'ID' as a valid $field in get_user_by().
We already accept 'id'. `ID` more closely matches the database and
`WP_User` schemas.

Props Shelob9.
Fixes #33869.

git-svn-id: https://develop.svn.wordpress.org/trunk@34125 602fd350-edb4-49c9-b593-d223f7449a82
2015-09-14 18:57:15 +00:00
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