Maya doesn't load OpenPype workfiles tool

[mkolar]

In maya we are accidentally loading default avalon workfiles tool, which is causing troubles in certain situations.

Specifically when trying to create a new file on a task that doesn't yet have work area created, we get nothing with this traceback.

# Traceback (most recent call last):
#   File "C:\Users\milan\code\openpype\repos\avalon-core\avalon\tools\workfiles\app.py", line 613, in on_save_as_pressed
#     self.initialize_work_directory()
#   File "C:\Users\milan\code\openpype\repos\avalon-core\avalon\tools\workfiles\app.py", line 652, in initialize_work_directory
#     app_definition = pipeline.lib.get_application(app_name)
#   File "C:\Users\milan\code\openpype\repos\avalon-core\avalon\lib.py", line 160, in get_application
#     "No application definition could be found for '%s'" % name
# ValueError: No application definition could be found for 'maya/2020'