webadmin: Fixed misalignment 'Copy Quota' dialog.

On the french version of the webadmin, Inside the "Copy Quota" dialog,
the "copy consumers and permissions" label was sliding of to the next
line.

This error was fixed by extending the width of
the "copyPermissionsEditor" field to 600px.

Change-Id: I5bb7d488d9570591215118633e69437bd0f6af17
Bug-Url: https://bugzilla.redhat.com/1123796
Signed-off-by: Tomer Saban <tsaban@redhat.com>