api,dbus: remove the option to send the SMS in the Create() call

An SMS must be first created with the Messaging interface, and then sent using the
Send() method from the SMS-specific interface.

src/mm-iface-modem-messaging.c

@@ -128,7 +128,6 @@ static gboolean
 handle_create (MmGdbusModemMessaging *skeleton,
                GDBusMethodInvocation *invocation,
                GVariant *dictionary,
-               gboolean send,
                MMIfaceModemMessaging *self)
 {
     GError *error = NULL;