Separate Delete/Move To Trash menu items in context menu

Right now these actions are in a visual group with "Rename" and "Add to
Places" which is silly as those actions have no logical connection
whatsoever to deletion.

This commits moves those items into the section above, putting them in a
more logical place and leaving the Delete/Move To Trash item in its own
section.

BUG: 429256
FIXED-IN: 21.04