Here the 1837 edition changed the relative pronoun that to who. Even so, nearby instances of those that have never been edited to those who:
Perhaps in Mosiah 19:13 there was some perceived difficulty with having those that immediately preceded by the subordinate conjunction that (“and it came to pass that those that tarried”). In any event, the critical text will restore the original those that. For further discussion, see under which in volume 3.
Summary: Restore in Mosiah 19:13 the original use of those that; nearly all instances of those that which were in the original text have not been edited to those who.