spec: fix f28 rpm without firewalld zone

Commit 3b71f2e4 added spec handling for with_firewalld_zone. We
now call %firewalld_reload if with_firewalld is set. But the matching
'BuildRequires: firewalld-filesystem' is only applied if
with_firewalld_zone is set.

Fix the former bit to use with_firewalld_zone
Reviewed-by: NLaine Stump <laine@laine.org>
Reported-by: NYuval Turgeman <yturgema@redhat.com>
Signed-off-by: NCole Robinson <crobinso@redhat.com>

libvirt.spec.in

@@ -1387,12 +1387,12 @@ fi
 rm -rf %{_localstatedir}/lib/rpm-state/libvirt || :
 
 %post daemon-driver-network
-%if %{with_firewalld}
+%if %{with_firewalld_zone}
     %firewalld_reload
 %endif
 
 %postun daemon-driver-network
-%if %{with_firewalld}
+%if %{with_firewalld_zone}
     %firewalld_reload
 %endif