webadmin: missing column in storage disks sub-tab

Storage -> Disks sub-tab:
Alignment column has been mistakenly
set to diskContainersColumn.

Change-Id: I2a93eb086725e248b458d23703092faff6bcf22f
Bug-Url: https://bugzilla.redhat.com/1084805
Signed-off-by: Daniel Erez <derez@redhat.com>