Async event handling is broken on HTML5

[JujuAdams]

Coroutines/scripts/CoroutineEventHook/CoroutineEventHook.gml

Lines 57 to 63 in 4e9f4ae

	case ev_async_web_networking: _key = "networking"; break;
	case ev_async_web: _key = "http"; break;
	case ev_async_social: _key = "social"; break;
	case ev_async_save_load: _key = "save_load"; break;
	case ev_async_dialog: _key = "dialog"; break;
	case ev_async_web_steam: _key = "steam"; break;
	case ev_async_system_event: _key = "system"; break;

Extracting the correct event name based on event_type and event_number doesn't work in HTML5 for reasons I haven't yet looked into.