webadmin: removing menu header from the menu in setup network dialog

Removing the "menu for" header from the menu in setup network dialog.

Bug-Url: https://bugzilla.redhat.com/1009774
Change-Id: I5634479c91046987591875954b3995fcd25c6d17
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>