Media: Pass thumbnail and medium sizes to image_constrain_size_for_editor() to force constraints based on the current DB options for those sizes. History: see #22598, #22738.

props jond3r.
see #23102.
for trunk.



git-svn-id: http://core.svn.wordpress.org/trunk@23264 1a063a9b-81f0-0310-95a4-ce76da25c4cd