Remove unused mock of extruders property

The extruders property is no longer being used by the code under test, so this mock is unnecessary. It's also a deprecated property.

Done during Turbo Testing and Tooling.

tests/Settings/TestCuraContainerRegistry.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2019 Ultimaker B.V.
+# Copyright (c) 2020 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
 
 import os #To find the directory with test files and find the test files.
@@ -251,14 +251,13 @@ def test_importProfileEmptyFileName(container_registry):
 
 
 mocked_application = unittest.mock.MagicMock(name = "application")
-mocked_plugin_registry = unittest.mock.MagicMock(name="mocked_plugin_registry")
+mocked_plugin_registry = unittest.mock.MagicMock(name = "mocked_plugin_registry")
 
 @unittest.mock.patch("UM.Application.Application.getInstance", unittest.mock.MagicMock(return_value = mocked_application))
 @unittest.mock.patch("UM.PluginRegistry.PluginRegistry.getInstance", unittest.mock.MagicMock(return_value = mocked_plugin_registry))
 class TestImportProfile:
-    mocked_global_stack = unittest.mock.MagicMock(name="global stack")
-    mocked_global_stack.extruders = {0: unittest.mock.MagicMock(name="extruder stack")}
-    mocked_global_stack.getId = unittest.mock.MagicMock(return_value="blarg")
+    mocked_global_stack = unittest.mock.MagicMock(name = "global stack")
+    mocked_global_stack.getId = unittest.mock.MagicMock(return_value = "blarg")
     mocked_profile_reader = unittest.mock.MagicMock()
 
     mocked_plugin_registry.getPluginObject = unittest.mock.MagicMock(return_value=mocked_profile_reader)