Update HubertFeatureReader to skip small chunks

[many-hats]

Very rarely, if the chunk is smaller than the kernel size and larger than the max_chunk size (e.g. (x.size(1) % max_chunk) < 10), the feature reader will produce a runtime error:

RuntimeError: Calculated padded input size per channel: (1). Kernel size: (10). Kernel size can't be greater than actual input size

I ran into this error when transcribing libri-light large with hubert-base-ls960 where there are two files that would produce this error and kill the job:
6454/13348/vicksburgnational_03_everhart_64kb_0014.flac with duration 1600001
and 9221/9912/cloudstudies_08_clayden_64kb_0016.flac with duration 3200001.

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