disable staking of blockstreamer node (#3655)

- this will stop it from entering leader rotation schedule

multinode-demo/fullnode.sh

@@ -32,6 +32,7 @@ while [[ ${1:0:1} = - ]]; do
     poll_for_new_genesis_block=1
     shift
   elif [[ $1 = --blockstream ]]; then
+    setup_stakes=0
     extra_fullnode_args+=("$1" "$2")
     shift 2
   elif [[ $1 = --enable-rpc-exit ]]; then