UI: Don't warn about bandwidth test mode if not authed

It was possible to enable the bandwidth test and disconnect your Twitch
account, resulting in a confusing prompt about streaming in bandwidth
test mode when trying to start a stream.

UI/window-basic-main.cpp

@@ -6275,9 +6275,14 @@ void OBSBasic::on_streamButton_clicked()
 		bool confirm = config_get_bool(GetGlobalConfig(), "BasicWindow",
 					       "WarnBeforeStartingStream");
 
-		obs_data_t *settings = obs_service_get_settings(service);
-		bool bwtest = obs_data_get_bool(settings, "bwtest");
-		obs_data_release(settings);
+		bool bwtest = false;
+
+		if (this->auth) {
+			obs_data_t *settings =
+				obs_service_get_settings(service);
+			bwtest = obs_data_get_bool(settings, "bwtest");
+			obs_data_release(settings);
+		}
 
 		if (bwtest && isVisible()) {
 			QMessageBox::StandardButton button =