Increase threshold for drawing top entities at bottom of screen

In a vertically-warping room, the 'height' of the room becomes 232
pixels, regardless of if you have a room name or not. So the remaining 8
rows of pixels at the bottom of the screen corresponds with the first 8
rows of pixels at the top of the screen, and entities in the bottom 8
rows of pixels get teleported to the top of the screen.

The screen wrapping drawing code doesn't draw entities in the top 8 rows
of pixels at the bottom, leading to a discontinuous effect where it
looks like vertically-warping entities don't neatly change from the
bottom to the top or vice versa - this is especially noticeable with
enemies. To fix this, just increase the threshold for drawing top
entities at the bottom of the screen by 8 pixels.

desktop_version/src/Graphics.cpp

@@ -1798,7 +1798,7 @@ void Graphics::drawentity(const int i, const int yoff)
         }
 
         wrappedPoint.y = tpoint.y;
-        if (tpoint.y < 0)
+        if (tpoint.y < 8)
         {
             wrapY = true;
             wrappedPoint.y += 232;