only register CompactTxStreamer once

cmd/server/main.go

@@ -220,14 +220,10 @@ func main() {
 				"error": err,
 			}).Fatal("couldn't create backend")
 		}
-		walletrpc.RegisterCompactTxStreamerServer(server, service)
-
 	    // Register service
 	    walletrpc.RegisterCompactTxStreamerServer(server, service)
 	}
 
-
-
     // Initialize mempool monitor
 	// exitMempool := make(chan bool)
 	// common.StartMempoolMonitor(cache, exitMempool)