2f3e5fd0 Renewal of previously set speed

If previously set speed of I is cancelled by pressing of a control lever or pressing of a pedal of a brake or pedal of coupling, pressing of the lever up in the direction of the inscription "+ RES" will restore the speed set before cancellation.
But if the speed of the car decreases to level about lower than 40 km/h, then previously set speed automatically will not be restored.