FileShouldVanishException mis-uses super()

[exarkun]

class FileShouldVanishException(Exception):
    """                                                                                                                                                                                                                                                                                   
    A file or files we expected to disappear did not within the                                                                                                                                                                                                                           
    timeout                                                                                                                                                                                                                                                                               
    """
    def __init__(self, path, timeout):
        super(self, FileShouldVanishException).__init__(
            u"'{}' still exists after {}s".format(path, timeout),
        )

The super() call has its arguments reversed.

[exarkun]

​https://github.com/tahoe-lafs/tahoe-lafs/pull/549

[exarkun]

Self-reviewing and merging to unblock myself for further magic-folder improvements.

[GitHub <noreply@…>]

In 6f7e125/trunk:

Merge pull request #549 from tahoe-lafs/2971.super-argument-order

Fix super() argument order

Fixes: ticket:2971