boards: keep INA238 shunt value for Skynode

This is an attempt to keep backwards compatible with Auterion's power
monitor which uses a shunt value of 0.0003 and not 0.0005.

boards/px4/fmu-v5x/init/rc.board_sensors

@@ -75,6 +75,8 @@ then
 	# Auto start power monitors
 	pm_selector_auterion start
 
+	# Auterion's INA238 uses a shunt value of 0.0003 instead of 0.0005.
+	param set-default INA238_SHUNT 0.0003
 else
 	#FMUv5Xbase board orientation
 

boards/px4/fmu-v6x/init/rc.board_sensors

@@ -59,6 +59,9 @@ fi
 if ver hwbasecmp 009 010 011
 then
 	pm_selector_auterion start
+
+	# Auterion's INA238 uses a shunt value of 0.0003 instead of 0.0005.
+	param set-default INA238_SHUNT 0.0003
 else
 	if [ $INA_CONFIGURED = no ]
 	then