UI: Add support for QSV encoder to simple output

obs/window-basic-main.cpp

@@ -738,6 +738,8 @@ bool OBSBasic::InitBasicConfigDefaults()
 			"flv");
 	config_set_default_uint  (basicConfig, "SimpleOutput", "VBitrate",
 			2500);
+	config_set_default_string(basicConfig, "SimpleOutput", "StreamEncoder",
+			SIMPLE_ENCODER_X264);
 	config_set_default_uint  (basicConfig, "SimpleOutput", "ABitrate", 160);
 	config_set_default_bool  (basicConfig, "SimpleOutput", "UseAdvanced",
 			false);