Utils: Make Layouting::Group { .. } less weird

It had a implicit vertical layout leading to unneded layout nesting
in quite a few cases. The price is an added Column { ... } in those
places where the implicit vertical layout was sufficient before.

Change-Id: I3ae1f03f9c1d691bd0c563b0447edd03ee02bbd2
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/valgrind/valgrindconfigwidget.cpp

@@ -89,10 +89,12 @@ ValgrindConfigWidget::ValgrindConfigWidget(ValgrindBaseSettings *settings)
         Span {
             2,
             Group {
-                s.enableCacheSim,
-                s.enableBranchSim,
-                s.collectSystime,
-                s.collectBusEvents,
+                Column {
+                    s.enableCacheSim,
+                    s.enableBranchSim,
+                    s.collectSystime,
+                    s.collectBusEvents,
+                }
             }
         }
     };