GPS Dynamic model default <1g

Only have it higher for VTOL and fixed wing.
Multicopter position controlled flight is in our experience always <1g.
Acrobatic flying definitely exceeds the acceleration but if control
doesn't rely on the GPS velocity and position there shouldn't be any
problem.

ROMFS/px4fmu_common/init.d/rc.mc_defaults

@@ -18,6 +18,8 @@ then
 	param set PWM_MAX 1950
 	param set PWM_MIN 1075
 	param set PWM_RATE 400
+
+	param set GPS_UBX_DYNMODEL 6
 fi
 
 #