Added 'contrib' to the archive areas list and reordered the sequence.
Added 'contrib' to the archive areas list and reordered the sequence.

Components from 'non-free' may need programs from contrib, thus add it.
The new ordering is also more logical/standard.

racing-tech/rrp-raspi-installer,racing-tech/rrp-raspi-installer,FooDeas/raspberrypi-ua-netinst,beylsp/rpi-installer,yodaaut/raspbian-ua-netinst,beylsp/rpi-installer