Allow us to return from whence we came. Specify wp_http_referer for user-edit...

Allow us to return from whence we came. Specify wp_http_referer for user-edit in the network admin, as we may come from network/users or site-users. props PeteMall, SergeyBiryukov, fixes #16053.

git-svn-id: https://core.svn.wordpress.org/trunk@17201 1a063a9b-81f0-0310-95a4-ce76da25c4cd