webadmin: fixed image alignment in Setup Host Networks

PatternFly patch caused some network boxes and 'Unassigned' label
to be misaligned in Hosts > Networks Interfaces > Setup Host Network
dialog. Fixed.

Change-Id: I13f677ea622c97de721adb0fbde162e18b792e6b
Signed-off-by: Greg Sheremeta <gshereme@redhat.com>