The previous one was wrong, and it did not work. It could be checked
inside compiled package in control.tar.gz that there was missing
``conffiles`` file with content `/etc/config/tvheadend`

It is also possible to verify that the config is not overwritten on the router
by running ``opkg install tvheadend --force-reinstall``

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>