removed hard coded shader start up

src/app/AppConfig.cpp

@@ -40,7 +40,7 @@ AppConfig DefaultAppConfig()
 	config.warmupTimeout = std::chrono::seconds(3);
 	config.prerollTimeout = std::chrono::seconds(3);
 	config.prerollPoll = std::chrono::milliseconds(2);
-	config.runtimeShaderId = "happy-accident";
+	config.runtimeShaderId.clear();
 	return config;
 }
 }