webadmin: bookmarks appear without scroll

- Fixed scrollbar on bookmarks not working on initial
load.

Change-Id: Iae752c8d3a92adb6de9f187fb98e5d3becc09c15
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=890166
Signed-off-by: Alexander Wels <awels@redhat.com>