Copter: remove unneeded telemetry_delayed parameter

ArduCopter/GCS_Mavlink.cpp

@@ -346,7 +346,7 @@ uint32_t GCS_MAVLINK_Copter::telem_delay() const
 // try to send a message, return false if it won't fit in the serial tx buffer
 bool GCS_MAVLINK_Copter::try_send_message(enum ap_message id)
 {
-    if (telemetry_delayed(chan)) {
+    if (telemetry_delayed()) {
         return false;
     }