fix(app): a scenario failing as it loads goes back to the launcher too, the files of other cases looked for only off Windows

A scenario failing past its opening popped the loader mode and went on to pop it again and push the driver mode with the scenery half loaded; it goes back to the launcher as one that can't be opened. FileCased() goes through the folder only where the file system tells the case apart: on Windows a missing file was looked for in its whole folder for nothing, and a name outside the code page threw from the parser. The Discord thread sleeps a quarter of a second outside the driver mode, not to hold the closing up.

application/application.cpp

@@ -272,7 +272,7 @@ void eu07_application::DiscordRPCService()
 		if (currentMode != mode::driver)
 		{
 			// the editor and the other modes: nothing to tell, without spinning a core on it
-			std::this_thread::sleep_for(std::chrono::milliseconds(1000));
+			std::this_thread::sleep_for(std::chrono::milliseconds(250));
 			continue;
 		}