userportal: fix remove multiple VMs

If multiple VMs were selected in UP extended view
only the first one was actually deleted.

Change-Id: I460eb5d6f0bead1df87fe9b0f221c66747cbea47
Signed-off-by: Tomas Jelinek <tjelinek@redhat.com>
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=947831