userportal: fix right-hand pane scrolling

In the User Portal, the right-hand pane took up too much space. The pane typically
had a horizontal scrollbar that caused the user to have to scroll to the right to
be able to edit the "Console options".

Fixed by removing min-width of 540px.

Change-Id: I80b358915c6a168d694b268a8cec08f9b18a5d72
Bug-Url: https://bugzilla.redhat.com/1001419
Signed-off-by: Greg Sheremeta <gshereme@redhat.com>