Utils: Make the second parameter to LayoutBuilder::attach() an enum

More explicit and more potential options (e.g. "treat grid as form")
than a bool.

Change-Id: I89413efe30410160c38b0e524ba64288dde2332e
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/debugger/debuggerrunconfigurationaspect.cpp

@@ -181,7 +181,7 @@ DebuggerRunConfigurationAspect::DebuggerRunConfigurationAspect(Target *target)
         static const QByteArray env = qgetenv("QTC_DEBUGGER_MULTIPROCESS");
         if (env.toInt())
             builder.addRow(m_multiProcessAspect);
-        return builder.emerge(false);
+        return builder.emerge(Layouting::WithoutMargins);
     });
 
     addDataExtractor(this, &DebuggerRunConfigurationAspect::useCppDebugger, &Data::useCppDebugger);