webadmin: fixed 'new network' dialog spacing issues

PatternFly patch caused the 'network label' label and field
in the 'new network' dialog to be badly positioned. Fixed.

Change-Id: I3acbba3cbd4b087714831347a986ea71cde7cc85
Bug-Url: https://bugzilla.redhat.com/1096845
Signed-off-by: Greg Sheremeta <gshereme@redhat.com>