largefiles: fix typo with s/__class/__class__/
Commit f78252429e0a (largefiles: don't create chain of __contains__
calls, 2015-03-11) introduced a typo with __class instead of
__class__. Let's fix it.
There are (obviously) no tests covering this code path, and I could
not figure out a way to trigger it, so it remains untested.
Spotted by Drew Gottlieb.
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