airframes/x500_v2: move motors from AUX to MAIN

Author: bkueng

ROMFS/px4fmu_common/init.d/airframes/4019_x500_v2

@@ -34,9 +34,9 @@ param set-default CA_ROTOR3_PX -0.25
 param set-default CA_ROTOR3_PY 0.25
 param set-default CA_ROTOR3_KM -0.05
 
-param set-default PWM_AUX_FUNC1 101
-param set-default PWM_AUX_FUNC2 102
-param set-default PWM_AUX_FUNC3 103
-param set-default PWM_AUX_FUNC4 104
-param set-default PWM_AUX_TIM0 -4
+param set-default PWM_MAIN_FUNC1 101
+param set-default PWM_MAIN_FUNC2 102
+param set-default PWM_MAIN_FUNC3 103
+param set-default PWM_MAIN_FUNC4 104
+param set-default PWM_MAIN_TIM0 -4