Fix machine name

CURA-6510

resources/qml/PrinterSelector/MachineSelector.qml

@@ -32,9 +32,9 @@ Cura.ExpandablePopup
             {
                 return Cura.MachineManager.activeMachineNetworkGroupName
             }
-            if(Cura.MachineManager.activeStack != null)
+            if(Cura.MachineManager.activeMachine != null)
             {
-                return Cura.MachineManager.activeStack.name
+                return Cura.MachineManager.activeMachine.name
             }
             return ""
         }