firewall.cgi: Allow to creating input rules from Orange to another zone.

firewall.cgi: Allow to creating input rules from Orange to another zone.

It was not able to create a firewall rule from the orange network to a
different network address of the firewall. ( For example: Orange -> IPFire's green address)

These rules always have been handled as FORWARD rules which is totaly
wrong.

Fixes #12265.

Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>
Tested-by: Peter Müller <peter.mueller@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>