RDISCROWD-8421 upload task guidelines image bugfix

[n00rsy]

Issue number of the reported bug or feature request: RDISCROWD-8421

Describe your changes
Fixes Error

Traceback (most recent call last):
  File "/bb/libexec/gigwork-priv/python/lib/python3.9/site-packages/flask/app.py", line 2070, in wsgi_app
    response = self.full_dispatch_request()
  File "/bb/libexec/gigwork-priv/python/lib/python3.9/site-packages/flask/app.py", line 1515, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/bb/libexec/gigwork-priv/python/lib/python3.9/site-packages/flask_cors/extension.py", line 165, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/bb/libexec/gigwork-priv/python/lib/python3.9/site-packages/flask/app.py", line 1513, in full_dispatch_request
    rv = self.dispatch_request()
  File "/bb/libexec/gigwork-priv/python/lib/python3.9/site-packages/flask/app.py", line 1499, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
  File "/bb/libexec/gigwork-priv/python/lib/python3.9/site-packages/flask_login/utils.py", line 272, in decorated_view
    return func(*args, **kwargs)
  File "/bb/libexec/gigwork-priv/python/lib/python3.9/site-packages/pybossa/util.py", line 227, in decorated_function
    return f(*args, **kwargs)
  File "/bb/libexec/gigwork-priv/python/lib/python3.9/site-packages/pybossa/view/projects.py", line 576, in upload_task_guidelines_image
    elif not is_admin_or_owner(project):
  File "/bb/libexec/gigwork-priv/python/lib/python3.9/site-packages/pybossa/view/projects.py", line 559, in is_admin_or_owner
    (project.owner_id == current_user.id or
AttributeError: 'tuple' object has no attribute 'owner_id'

[coveralls]

Pull Request Test Coverage Report for Build 19863620835

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 94.067%

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Totals
Change from base Build 19639530476:	0.0%
Covered Lines:	17883
Relevant Lines:	19011

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💛 - Coveralls

[dchhabda]

minor. owner, ps as unused can be replaced with underscores