Split the INSTALL_MODULES value into separate lines.
Split the INSTALL_MODULES value into separate lines.

This makes it better readable since each module is on it's own line.

Zeerix/raspbian-ua-netinst,yodaaut/raspbian-ua-netinst,kolargol/raspbian-ua-netinst,dicer/raspbian-ua-netinst,daytonpid/FireHawk,bbinet/raspbian-ua-netinst,matt2005/raspbian-ua-netinst,firepick/FireHawk,jturner314/raspbian-ua-netinst,malsony/raspbian-ua-netinst,racing-tech/rrp-raspi-installer,beylsp/rpi-installer,cybercircuits/raspbian-ua-netinst,racing-tech/rrp-raspi-installer,beylsp/rpi-installer,FooDeas/raspberrypi-ua-netinst