Update Canon and Nikon lens lists to match ExifTool version 9.64.

git-svn-id: svn://dev.exiv2.org/svn@3259 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3
Fix bug #959: Wrong value in Exiv data for Sigma lenses (24-105 & 50).

git-svn-id: svn://dev.exiv2.org/svn@3260 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3