commander: increase COM_ARM_MAG_ANG 35 -> 45 degrees

- in practice this is mostly useful for identifying incorrect rotations
which we mostly have in 45 degree increments
 - handling a vehicle on the ground can easily disturb one mag by more than 30 degrees, so this is often distracting noise

src/modules/commander/Arming/PreFlightCheck/checks/magConsistencyCheck.cpp

@@ -60,7 +60,7 @@ bool PreFlightCheck::magConsistencyCheck(orb_advert_t *mavlink_log_pub, vehicle_
 
 	// Use the difference between sensors to detect a bad calibration, orientation or magnetic interference.
 	// If a single sensor is fitted, the value being checked will be zero so this check will always pass.
-	int32_t angle_difference_limit_deg;
+	int32_t angle_difference_limit_deg = 90;
 	param_get(param_find("COM_ARM_MAG_ANG"), &angle_difference_limit_deg);
 
 	pass = pass || angle_difference_limit_deg < 0; // disabled, pass check

src/modules/commander/commander_params.c

@@ -616,7 +616,7 @@ PARAM_DEFINE_FLOAT(COM_ARM_IMU_GYR, 0.25f);
  * @min 3
  * @max 180
  */
-PARAM_DEFINE_INT32(COM_ARM_MAG_ANG, 30);
+PARAM_DEFINE_INT32(COM_ARM_MAG_ANG, 45);
 
 /**
  * Enable mag strength preflight check