webadmin: Fix Add brick popup issue

While creating a new gluster volume, the Add Brick
popup will be opened automatically while changing
the volume type if the brick count is greater than 0.

Change-Id: Iec1c95e1fb5ddcbd3bf49ae72410293db2454d25
Bug-Url: https://bugzilla.redhat.com/884441
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>