Use Rectangle#scale in IScalablePane#getScaledRect

This commit replaces the scaling in IScalablePane#getScaledRect
for width and height of a Rectangle with using Rectangle#scale instead.

Author: akoch-yatta

org.eclipse.draw2d/src/org/eclipse/draw2d/IScalablePane.java

@@ -30,10 +30,7 @@ public interface IScalablePane extends ScalableFigure {
 
 	public default Rectangle getScaledRect(Rectangle rect) {
 		double scale = getScale();
-		rect.width /= scale;
-		rect.height /= scale;
-		rect.x /= scale;
-		rect.y /= scale;
+		rect.scale(1 / scale);
 		return rect;
 	}