Fix back compat issues with delete_postmeta and deleted_postmeta actions as...

Fix back compat issues with delete_postmeta and deleted_postmeta actions as these should be passed the meta ID. Fixes #18825.


git-svn-id: https://core.svn.wordpress.org/trunk@18835 1a063a9b-81f0-0310-95a4-ce76da25c4cd