Enabling debug from snap traceback

[Adam Collard]

$ sudo snap run maas config --enable-debug
Traceback (most recent call last):
  File "/snap/maas/11322/bin/maas", line 8, in <module>
    sys.exit(main())
  File "/snap/maas/11322/lib/python3.8/site-packages/maascli/__init__.py", line 44, in main
    options.execute(options)
  File "/snap/maas/11322/lib/python3.8/site-packages/maascli/snappy.py", line 433, in __call__
    raise exc
  File "/snap/maas/11322/lib/python3.8/site-packages/maascli/snappy.py", line 430, in __call__
    self.handle(options)
  File "/snap/maas/11322/lib/python3.8/site-packages/maascli/snappy.py", line 822, in handle
    if options.mode != running_mode:
AttributeError: 'Namespace' object has no attribute 'mode'

$ snap list maas
Name Version Rev Tracking Publisher Notes
maas 2.9.1-9153-g.66318f531 11322 2.9/stable canonical✓