CloudViewer: fixed numpad color not working -> reverted changes from https://github.com/introlab/rtabmap/commit/ad0afc58c0d404b420108e527e454201d89a840e#diff-d7a550026127f42ccabdb5e42979eeeb

guilib/src/CloudViewer.cpp

@@ -1654,7 +1654,7 @@ void CloudViewer::keyReleaseEvent(QKeyEvent * event) {
 	}
 	else
 	{
-		QWidget::keyPressEvent(event);
+		QVTKWidget::keyPressEvent(event);
 	}
 }
 
@@ -1754,7 +1754,7 @@ void CloudViewer::keyPressEvent(QKeyEvent * event)
 	}
 	else
 	{
-		QWidget::keyPressEvent(event);
+		QVTKWidget::keyPressEvent(event);
 	}
 }