[tf.data] Remove unused job_token parameter.
[tf.data] Remove unused job_token parameter.

This was originally introduced when we explicitly managed data service job tokens in Python. Job tokens are now managed in c++ instead, so this parameter is no longer unused.

This CL also calls super(OwnedIterator, self).__init__() to prevent a lint error.

PiperOrigin-RevId: 328549745
Change-Id: I1df491f646f39aaf7c6b99e0e7257cd6cd94cc73

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