Remove implementation of __getattr__ for UniSchema

[v01dXYZ]

Hello,
I found a very minor issue (probably a typo):

petastorm/petastorm/unischema.py

Lines 355 to 356 in d6f4e82

	def __getattr__(self, item) -> Any:
	return super().__getattribute__(item)

This is not really required (basically since we don't reimplement __getattribute__, that will always be object.__getattribute__(obj, item) that will be invoked when we getattr).

[selitvin]

Thanks for the report. Will clean it up (or feel free to submit a fix in a PR :) ).