[win32] fix for rounding issues when scaling fonts

This commit fixes the calculation of the height when scaling a font for
a different zoom when monitor-specific scaling is active

Author: akoch-yatta

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

@@ -54,8 +54,7 @@ private Font getScaledFont(int targetZoom) {
 		private Font scaleFont(int zoom) {
 			FontData fontData = baseFont.getFontData()[0];
 			int baseZoom = computeZoom(fontData);
-			int zoomScaleFactor = Math.round(1.0f * zoom / baseZoom);
-			fontData.data.lfHeight *= zoomScaleFactor;
+			fontData.data.lfHeight = Math.round(1.0f * fontData.data.lfHeight * zoom / baseZoom);
 			Font scaledFont = Font.win32_new(device, fontData, zoom);
 			addScaledFont(zoom, scaledFont);
 			return scaledFont;