docker: fix chain for lnd_ltc

docker/docker-compose.ltc.yml

@@ -29,7 +29,7 @@ services:
         - RPCUSER
         - RPCPASS
         - NETWORK
-        - CHAIN
+        - CHAIN=litecoin
         - DEBUG
       volumes:
         - shared:/rpc

docker/lnd/start-lnd.sh

@@ -59,7 +59,7 @@ exec lnd \
     --noseedbackup \
     "--$CHAIN.active" \
     "--$CHAIN.$NETWORK" \
-    "--$CHAIN.node"="btcd" \
+    "--$CHAIN.node"="$BACKEND" \
     "--$BACKEND.rpccert"="/rpc/rpc.cert" \
     "--$BACKEND.rpchost"="blockchain" \
     "--$BACKEND.rpcuser"="$RPCUSER" \