webadmin : volume rebalance status bug corrected

In volume rebalance status pop up window,rebalance status query was getting
executed every 10s even after closing the pop up.
Now,it has been corrected.

Change-Id: Ibc9f37cc55ee540250b434da3ad06de90a502591
Signed-off-by: Anmol Babu <anbabu@redhat.com>