Abstract printer types: Sort newer ones on top.

Partial (manual) revert of initial implementatio of CURA-9748 -- that first commit deleted the 'reverse = True' needed to make sure (read hack) the most recent abstract printer types on top, instead of the other way around.

cura/Machines/Models/MachineListModel.py

@@ -89,7 +89,7 @@ class MachineListModel(ListModel):
         other_machine_stacks.sort(key = lambda machine: machine.getName().upper())
 
         abstract_machine_stacks = CuraContainerRegistry.getInstance().findContainerStacks(is_abstract_machine = "True")
-        abstract_machine_stacks.sort(key = lambda machine: machine.getName().upper())
+        abstract_machine_stacks.sort(key = lambda machine: machine.getName().upper(), reverse = True)
         for abstract_machine in abstract_machine_stacks:
             definition_id = abstract_machine.definition.getId()
             online_machine_stacks = machines_manager.getMachinesWithDefinition(definition_id, online_only = True)