Remove unnecessary getFigure call in RulerViewport

This commit simplifies a translateToRelative call as the call to
getFigure will return the RulerViewport itself.

Author: akoch-yatta

org.eclipse.gef/src/org/eclipse/gef/internal/ui/rulers/RulerRootEditPart.java

@@ -250,7 +250,7 @@ public void setContents(IFigure figure) {
 		@Override
 		public Point getViewLocation() {
 			Point viewLocation = new Point(getHorizontalRangeModel().getValue(), getVerticalRangeModel().getValue());
-			getFigure().translateToRelative(viewLocation);
+			translateToRelative(viewLocation);
 			return viewLocation;
 		}