webadmin: fix for stop remove brick issue in status popup

   Removing the unnecessary selected items check in
onStopRemoveBrick method which blocks stop remove brick
action from status pop up launched from volumes tab.

Change-Id: If116f08fd99d42126ecf725fd50d8d7f51d2eceb
Signed-off-by: Ramesh Nachimuthu <rnachimu@redhat.com>