Update 4401_ssrc_fog_x_tmotor mag0 prio

Param should be set as default so it is changeable by user. Further I propose setting it to a lower priority than external one. This makes the drone usable without external mag but will still prioritize the external one if it is installed

ROMFS/px4fmu_common/init.d/airframes/4401_ssrc_fog_x_tmotor

@@ -79,7 +79,7 @@ param set-default BAT2_CAPACITY 22000
 param set-default SENS_EN_LL40LS 2
 
 # Disable internal magnetometer
-param set CAL_MAG0_PRIO 0
+param set-default CAL_MAG0_PRIO 25
 
 # LEDs on TELEMETRY 1
 param set-default SER_TEL1_BAUD 57600