chore: Update network id for graph-node-fastchain (#242)

Needed by streamr-dev/network-contracts#1012.

Author: teogeb

docker-compose.yml

@@ -248,7 +248,7 @@ services:
             postgres_pass: let-me-in
             postgres_db: streamr
             ipfs: 'streamr-dev-ipfs:5001'
-            ethereum: 'xDai:http://streamr-dev-chain-fast:8545'
+            ethereum: 'dev2:http://streamr-dev-chain-fast:8545'
             RUST_LOG: info
             GRAPH_ALLOW_NON_DETERMINISTIC_FULLTEXT_SEARCH: "true"
         healthcheck: