firewall: Remove assigning zones to interfaces
firewall: Remove assigning zones to interfaces

This is now properly handled by freedombox-setup network scripts.  There
is no need to set it up here.  Also there is chance they might by
configured wrong.

jvalleroy/plinth-debian,freedomboxtwh/Plinth,vignanl/Plinth,kkampardi/Plinth,freedomboxtwh/Plinth,jvalleroy/plinth-debian,kkampardi/Plinth,kkampardi/Plinth,jvalleroy/plinth-debian,harry-7/Plinth,harry-7/Plinth,harry-7/Plinth,vignanl/Plinth,vignanl/Plinth,harry-7/Plinth,vignanl/Plinth,freedomboxtwh/Plinth,freedomboxtwh/Plinth,vignanl/Plinth,freedomboxtwh/Plinth,kkampardi/Plinth,jvalleroy/plinth-debian,kkampardi/Plinth,harry-7/Plinth,jvalleroy/plinth-debian