Copter: removed check on target component in arm

Thanks to DonLakeFlyer for finding this, see
https://github.com/diydrones/ardupilot/pull/909

ArduCopter/GCS_Mavlink.pde

@@ -1240,22 +1240,18 @@ void GCS_MAVLINK::handleMessage(mavlink_message_t* msg)
             break;
 
         case MAV_CMD_COMPONENT_ARM_DISARM:
-            if (packet.target_component == MAV_COMP_ID_SYSTEM_CONTROL) {
+            if (packet.param1 == 1.0f) {
-                if (packet.param1 == 1.0f) {
+                // run pre_arm_checks and arm_checks and display failures
-                    // run pre_arm_checks and arm_checks and display failures
+                pre_arm_checks(true);
-                    pre_arm_checks(true);
+                if(ap.pre_arm_check && arm_checks(true)) {
-                    if(ap.pre_arm_check && arm_checks(true)) {
+                    init_arm_motors();
-                        init_arm_motors();
-                        result = MAV_RESULT_ACCEPTED;
-                    }else{
-                        result = MAV_RESULT_UNSUPPORTED;
-                    }
-                } else if (packet.param1 == 0.0f)  {
-                    init_disarm_motors();
                     result = MAV_RESULT_ACCEPTED;
-                } else {
+                }else{
                     result = MAV_RESULT_UNSUPPORTED;
                 }
+            } else if (packet.param1 == 0.0f)  {
+                init_disarm_motors();
+                result = MAV_RESULT_ACCEPTED;
             } else {
                 result = MAV_RESULT_UNSUPPORTED;
             }