Fix driver status delta message to make more sense

The driver status message would show "currently leading" while
waiting for the race to start. Fixed this to handle pre-race delta
of 0.

I am not sure if there are cases where delta might be 0 for a position
greater than 1 but have a placeholder output of "i don't know" for now.
Output car make in the driver status message

Now output the make of the car (Toyota, Chevy, Ford) in the
driver status message.