Fixed routing issue when trying to clone a VM from a non-explorer layout

The action specified for page rendering was changed from
"miq_request/prov_edit" to simply "prov_edit" since it was throwing off
the ActionController and causing a routing error
Merge pull request #281 from AparnaKarve/miq_request_routing_issue

Fixed the routing issue when trying to clone a VM from a non-explorer layout