UI: Test first 3 closest Twitch ingests in auto-config

If auto is available, test the first 3 closest Twitch ingests rather
than using a region-based selection.

UI/window-basic-auto-config.hpp

@@ -87,6 +87,7 @@ class AutoConfig : public QWizard {
 	bool customServer = false;
 	bool bandwidthTest = false;
 	bool testRegions = true;
+	bool twitchAuto = false;
 	bool regionUS = true;
 	bool regionEU = true;
 	bool regionAsia = true;