Acoustice Model Training - realigning the training data - remove pruning

[kmaclean]

See ​tpavelka's post:

It may happen (usually during a big mismatch between transcript and the actual speech in the recording) that no tokens reach the end of the utterence due to pruning. In that case the sentence is not included in aligned.mlf, but HTK does not report any errors. When HERest is run again, it throws an error and ends because it cannot find the transcription of the sentence in aligned.mlf.

This can be solved by switching off pruning: leave out the -t switch.