Revert "Move cura-import to top of the file"

This reverts commit 5082e64f0c1d60e4820a3ba35fd3ca82c8be3051.

cura/Settings/CuraStackBuilder.py

@@ -9,7 +9,6 @@ from UM.Settings.Interfaces import DefinitionContainerInterface
 from UM.Settings.InstanceContainer import InstanceContainer
 
 from cura.Machines.ContainerTree import ContainerTree
-from cura.CuraApplication import CuraApplication
 from .AbstractMachine import AbstractMachine
 from .GlobalStack import GlobalStack
 from .ExtruderStack import ExtruderStack
@@ -278,6 +277,7 @@ class CuraStackBuilder:
         """
         abstract_machine_id = definition_id + "_abstract_machine"
 
+        from cura.CuraApplication import CuraApplication
         application = CuraApplication.getInstance()
         registry = application.getContainerRegistry()
         container_tree = ContainerTree.getInstance()