Layouting: Handle attach types via setter

Change-Id: I862f5cd109db3582b4f029787ec0cded2da39ce6
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/cmakeprojectmanager/cmakeinstallstep.cpp

@@ -108,8 +108,9 @@ QWidget *CMakeInstallStep::createConfigWidget()
 
     Layouting::Form builder;
     builder.addRow({m_cmakeArguments});
+    builder.addItem(Layouting::noMargin);
 
-    auto widget = builder.emerge(Layouting::WithoutMargins);
+    auto widget = builder.emerge();
 
     updateDetails();