webadmin : fixed rebalance status dialog close button issue

Fixed Clicking on the 'x' button does not close the status dialog.

Now,Clicking on the 'x' button closes the status dialog.

Change-Id: Ic0363784b13b26603f1f6279423adcac5e592045
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1012329
Signed-off-by: Anmol Babu <anbabu@redhat.com>