Fix missing "group_name" renaming

CURA-6153

resources/qml/Preferences/MachinesPage.qml

@@ -56,7 +56,7 @@ UM.ManagementPage
         {
             text: catalog.i18nc("@action:button", "Rename");
             iconName: "edit-rename";
-            enabled: base.currentItem != null && base.currentItem.metadata.connect_group_name == null
+            enabled: base.currentItem != null && base.currentItem.metadata.group_name == null
             onClicked: renameDialog.open();
         }
     ]