gluster: Corrected the remove bricks status at issue

Corrected to set the correct value of the started at field value for the
task started for removal of gluster volumes bricks.

Change-Id: I0d6d5dacffef2306545e269c2d7df08238e4e166
Signed-off-by: Shubhendu Tripathi <shtripat@redhat.com>