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/autotest/qtest/qttestsettings.cpp

@@ -134,7 +134,7 @@ QtTestSettingsPage::QtTestSettingsPage(QtTestSettings *settings, Id settingsId)
             },
             Group {
                 Title(QtTestSettings::tr("Benchmark Metrics")),
-                s.metrics
+                Column { s.metrics }
             },
         };