webadmin: fixed add/remove widget in 'add bond' dialog

PatternFly update broke the add/remove widget in 'Hosts > Networks Interfaces
> Setup Host Network > add bond' dialog. Fixed.

Change-Id: I1c5b43d919b5418790fd6bf2cd3d5c4335435cb1
Signed-off-by: Greg Sheremeta <gshereme@redhat.com>