Copter: correct typo in error #define

ArduCopter/defines.h

@@ -435,7 +435,7 @@ enum ap_message {
 #define ERROR_SUBSYSTEM_FAILSAFE_GPS        7
 #define ERROR_SUBSYSTEM_FAILSAFE_GCS        8
 #define ERROR_SUBSYSTEM_FAILSAFE_FENCE      9
-#define ERROR_SUBSYSTEM_FLGHT_MODE          10
+#define ERROR_SUBSYSTEM_FLIGHT_MODE         10
 #define ERROR_SUBSYSTEM_GPS                 11
 // general error codes
 #define ERROR_CODE_ERROR_RESOLVED           0

ArduCopter/system.pde

@@ -479,7 +479,7 @@ static bool set_mode(uint8_t mode)
         Log_Write_Mode(control_mode);
     }else{
         // Log error that we failed to enter desired flight mode
-        Log_Write_Error(ERROR_SUBSYSTEM_FLGHT_MODE,mode);
+        Log_Write_Error(ERROR_SUBSYSTEM_FLIGHT_MODE,mode);
     }
 
     // return success or failure