Fixes for Wav2Vec example

[SeanNaren]

What does this PR do?

limiting batches shouldn't be happening!

Before submitting

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• Did you write any new necessary tests? [not needed for typos/docs]
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PR review

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Did you have fun?

Make sure you had fun coding 🙃

[ethanwharris]

LGTM 😃

[codecov]

Codecov Report

Merging #609 (e3203b2) into master (08b56dd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #609   +/-   ##
=======================================
  Coverage   89.98%   89.98%           
=======================================
  Files         149      149           
  Lines        8457     8457           
=======================================
  Hits         7610     7610           
  Misses        847      847           

Flag	Coverage Δ
gpu	?
pytest	?
unittests	89.98% <ø> (ø)

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