[FAB-13232] fix peer node start command

The -o flag was a legacy option on `peer node start` and has been
removed.

Change-Id: Idf3cf57d39461b57c6f61b32e971e14031278e3f
Signed-off-by: Matthew Sykes <sykesmat@us.ibm.com>

chaincode-docker-devmode/docker-compose-simple.yaml

@@ -35,7 +35,7 @@ services:
         - /var/run/:/host/var/run/
         - ./msp:/etc/hyperledger/msp
     working_dir: /opt/gopath/src/github.com/hyperledger/fabric/peer
-    command: peer node start --peer-chaincodedev=true -o orderer:7050
+    command: peer node start --peer-chaincodedev=true
     ports:
       - 7051:7051
       - 7053:7053