Here the 1906 LDS edition replaced the plural paths with path; but since that edition was never used as a copytext, that error was not perpetuated in any subsequent LDS edition. As explained under Mosiah 2:36, the plural paths “in wisdom’s paths” is the correct expression for the Book of Mormon.
Summary: Maintain in Helaman 12:5, as in Mosiah 2:36, the plural paths in the phrase “in wisdom’s paths”, the reading of the earliest textual sources.