docker: add missing backslash to start-lnd.sh

docker/lnd/start-lnd.sh

@@ -46,7 +46,7 @@ NETWORK=$(set_default "$NETWORK" "simnet")
 CHAIN=$(set_default "$CHAIN" "bitcoin")
 
 lnd \
-    --noencryptwallet
+    --noencryptwallet \
     --logdir="/data" \
     "--$CHAIN.rpccert"="/rpc/rpc.cert" \
     "--$CHAIN.active" \