When a dynamic interface is up, we still need to report that it's "dynamic" to this GUI in system_gateways_edit.php.
If user edits a dynamic gateway that is up, the gateway IP address (reported by return_gateways_array) will end up in the "Gateway" field, and then the gateway will get saved as a static gateway unless user manually changes field to "dynamic" again.
Added by Marcus Brown almost 15 years ago
When a dynamic interface is up, we still need to report that it's "dynamic" to this GUI in system_gateways_edit.php.
If user edits a dynamic gateway that is up, the gateway IP address (reported by return_gateways_array) will end up
in the "Gateway" field, and then the gateway will get saved as a static gateway unless user manually changes field
to "dynamic" again.