Remove count parameter from SetViewports. No use foreseen.

Common/UI/UIScreen.cpp

@@ -102,7 +102,7 @@ void UIScreen::preRender() {
 	viewport.Height = pixel_yres;
 	viewport.MaxDepth = 1.0;
 	viewport.MinDepth = 0.0;
-	draw->SetViewports(1, &viewport);
+	draw->SetViewport(viewport);
 	draw->SetTargetSize(pixel_xres, pixel_yres);
 }