fixed broken promise when reconnecting on baudRate changes.

Signed-off-by: Akos Kitta <kittaakos@typefox.io>

arduino-ide-extension/src/browser/monitor/monitor-connection.ts

@@ -188,6 +188,7 @@ export class MonitorConnection {
                             // First, disconnect if connected.
                             if (this.connected) {
                                 this.disconnect().then(() => resolve());
+                                return;
                             }
                             resolve();
                         }).then(() => {