[Win32] Improve pixel-to-point conversion precision

With recent changes to the rounding of pixel-to-point conversions the
calculated sizes became too small in several use cases, leading to
cut-off elements. This change adapts the rounding method to reduce the
number of relevant cut-offs.

Author: HeikoKlare

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/internal/Win32DPIUtils.java

@@ -124,7 +124,7 @@ public static Point pixelToPointAsLocation(Drawable drawable, Point point, int z
 	}
 
 	public static Point pixelToPointAsSize(Point point, int zoom) {
-		return pixelToPoint(point, zoom, RoundingMode.DOWN);
+		return pixelToPoint(point, zoom, RoundingMode.ROUND);
 	}
 
 	public static Point pixelToPointAsLocation(Point point, int zoom) {