Adding a new printer now activates it again

CURA-3783

cura/Settings/MachineManager.py

@@ -350,9 +350,7 @@ class MachineManager(QObject):
     def addMachine(self, name: str, definition_id: str) -> None:
         new_stack = CuraStackBuilder.createMachine(name, definition_id)
         if new_stack:
-            # only set the global container stack if there was none
-            if self._global_container_stack is None:
-                Application.getInstance().setGlobalContainerStack(new_stack)
+            Application.getInstance().setGlobalContainerStack(new_stack)
         else:
             Logger.log("w", "Failed creating a new machine!")