Fuel average affected by idling

[thatdevsherry]

Fuel average is supposed to show the average when car is in motion.

Glancing at the code, it appears I've missed out the check for updating "fuel_used_motion_ul`. It should only update when vehicle speed is greater than 0.

So presumably both fuel_used_motion_ul and fuel_used_total_ul come out to same value.

Fix by adding a check to only update fuel_used_motion_ul when VSS > 0. fuel_used_total_ul is for total fuel use, fuel_used_motion_ul is for fuel used when moving and is what's used for fuel average calculation.