test-zstd-versions.py: fixed creation of dictionaries for v0.5.1+
test-zstd-versions.py: fixed creation of dictionaries for v0.5.1+

ds77/zstd,ds77/zstd,Cyan4973/zstd,inikep/zstd,Cyan4973/zstd,inikep/zstd,Cyan4973/zstd,Majlen/zstd,Majlen/zstd,inikep/zstd,Majlen/zstd,inikep/zstd,Cyan4973/zstd,ds77/zstd,Cyan4973/zstd,ds77/zstd,Majlen/zstd