printers: Don't set color for selected text

Show description of selected device in default color
in new printer dialog.

https://bugzilla.gnome.org/show_bug.cgi?id=693183
printers: Show connection type of found devices

Parse URIs of devices found by the new printer dialog and
show types of their connections for local printers or
locations for network printers or addresses for network
printers.

https://bugzilla.gnome.org/show_bug.cgi?id=693183