Delete unneeded constants, PartSize is already 5MB by default
Delete unneeded constants, PartSize is already 5MB by default

pachyderm/pfs,phacops/pachyderm,wideioltd/pachyderm,wideioltd/pachyderm,klucar/pachyderm,alexdebrie/pachyderm,ShengjieLuo/pachyderm,ShengjieLuo/pachyderm,kunthar/pachyderm,klucar/pachyderm,klucar/pachyderm,henrylee2cn/pachyderm,pachyderm/pfs,kunthar/pachyderm,sambooo/pachyderm,henrylee2cn/pachyderm,pachyderm/pfs,alexdebrie/pachyderm,sambooo/pachyderm,phacops/pachyderm,ShengjieLuo/pachyderm,sambooo/pachyderm,alexdebrie/pachyderm