[packaging] drop old uxlaunch startup file.

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>
[session] It is now expected that each service installs its own service file to right place.

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>
Merge pull request #21 from saukko/master

fix startup