pzstd: fix test failure on headless build
pzstd: fix test failure on headless build

Remove this test as pass/fail status is
dependent on whether I/O is connected to a tty.
It currrently passes on a tty but fails on
a package build system for example.

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