winport - fix hd prescale vs gap (#1505)

desmume/src/windows/main.cpp

@@ -3164,6 +3164,7 @@ int _main()
 
 	SetMinWindowSize();
 
+	//BUGZOOM
 	ScaleScreen(windowSize, false);
 
 	DragAcceptFiles(MainWindow->getHWnd(), TRUE);

desmume/src/windows/video.h

@@ -311,6 +311,6 @@ public:
 	}
 
 	int scaledscreengap() {
-		return screengap * height / (384 * prescaleHD);
+		return screengap * height / 384;
 	}
 };