rest-gw: Fix listening endpoint config

Previous configuration has not worked from `[email protected]`. The
gateway saw no configured endpoints and used default `localhost:8080`
which is already bound to the storage node.

Fixes
```
fatal	neofs-rest-gw/main.go:119	start http	{"error": "listen tcp 127.0.0.1:8080: bind: address already in use"}
```

Signed-off-by: Leonard Lyubich <[email protected]>

rest-gw/rest.env

@@ -2,4 +2,4 @@ REST_GW_WALLET_PATH=/config/wallet-rest.json
 REST_GW_WALLET_PASSPHRASE=one
 REST_GW_WALLET_ADDRESS=NPFCqWHfi9ixCJRu7DABRbVfXRbkSEr9Vo
 REST_GW_POOL_PEERS_0_ADDRESS=localhost:8080
-REST_GW_SERVER_LISTEN_ADDRESS=0.0.0.0:8090
+REST_GW_SERVER_ENDPOINTS_0_ADDRESS=0.0.0.0:8090