vout_ios2: fix touch event propagation on retina displays

modules/video_output/ios2.m

@@ -511,8 +511,9 @@ static void OpenglESSwap(vlc_gl_t *gl)
 {
     UIGestureRecognizerState state = [tapRecognizer state];
     CGPoint touchPoint = [tapRecognizer locationInView:self];
+    CGFloat scaleFactor = self.contentScaleFactor;
     vout_display_SendMouseMovedDisplayCoordinates(_voutDisplay, ORIENT_NORMAL,
-                                                  (int)touchPoint.x, (int)touchPoint.y,
+                                                  (int)touchPoint.x * scaleFactor, (int)touchPoint.y * scaleFactor,
                                                   &_voutDisplay->sys->place);
 
     vout_display_SendEventMousePressed(_voutDisplay, MOUSE_BUTTON_LEFT);