Use setHideEmptyRowsAndColumns to match old screenshots (#14392)

Change-Id: Ifd735d55c768c351359f0b65de05da0e701f099c

uitest/src/com/vaadin/tests/components/LayoutAttachListenerInfo.java

@@ -122,6 +122,7 @@ public class LayoutAttachListenerInfo extends TestBase {
         final GridLayout g = new GridLayout(4, 4);
         g.setWidth("300px");
         g.setHeight("300px");
+        g.setHideEmptyRowsAndColumns(true);
         g.addComponentAttachListener(new ComponentAttachListener() {
             @Override
             public void componentAttachedToContainer(ComponentAttachEvent event) {

uitest/src/com/vaadin/tests/layouts/TestLayoutClickListeners.java

@@ -106,6 +106,7 @@ public class TestLayoutClickListeners extends AbstractTestUIWithLog {
         gl.setWidth("564px");
         gl.setStyleName("borders");
         gl.setSpacing(true);
+        gl.setHideEmptyRowsAndColumns(true);
         addContent(gl, 4);
         TextArea largeTextarea = new TextArea("Large textarea");
         largeTextarea.setWidth("100%");