Removed car_chargelimit_soclimit / _rangelimit = -1

1) The values ar_chargelimit_soclimit and ar_chargelimit_rangelimit are unsigned, they are "suppressed" in net_msg (>0) and set to 0 in ohms.c, so they make no sense to set them to -1 in vehicle_thinkcity.c

2) The car_stale_temps in poll1 is moved to the top of the case, because the car_tpem did come out with 0 the very first time the ovms unit was initialized. After key-on or charge-on, the car_tpem reported a value.

I have compiled the changes, flashed it to my ovms  and it worked.