Reference to obsolete (removed) repo in setup-script

[tniercke]

tx-pi/setup/tx-pi-setup.sh

Line 129 in 72f8a70

deb http://raspbian.raspberrypi.org/raspbian/ jessie main contrib non-free rpi

The referenced jessie repo was removed from the raspbian server and is no longer available.
Thus the setup-script will stop installing TX-PI.