docker: tail logs from host

now that we have the log mapped to host folder we can simply tail it there

docker/logs.sh

@@ -4,4 +4,4 @@ cd "$(dirname "${BASH_SOURCE[0]}")"
 
 . _settings.sh
 
-exec docker exec lntop tail /root/.lntop/lntop.log "$@"
+exec tail "$@" "$LNTOP_HOME/lntop.log"