When deleting an image in the editor with the delete or backspace keys, hide...

When deleting an image in the editor with the delete or backspace keys, hide the edit and delete popup buttons.

Props azaozz, lessbloat
fixes #22717


git-svn-id: https://core.svn.wordpress.org/trunk@23046 1a063a9b-81f0-0310-95a4-ce76da25c4cd