Move tor-launcher script tor /usr/local/bin.

Let's not pretend the current script is similar to what upstream would
use, since it has Tails specific stuff in it.

config/chroot_local-includes/usr/local/sbin/tails-tor-launcher

@@ -42,7 +42,7 @@ done
 export LANG
 export_gnome_env
 sudo -u ${LIVE_USERNAME} xhost +SI:localuser:tor-launcher
-gksudo -u tor-launcher /usr/bin/tor-launcher
+gksudo -u tor-launcher /usr/local/bin/tor-launcher
 RET=${?}
 sudo -u ${LIVE_USERNAME} xhost -SI:localuser:tor-launcher