tests: remove hg10 requirement from test-check-pylint.t
Since pylint does its own directory traversal to find files to check and
doesn't use hg locate command, this requirement is not valid.
See also
a29f071751df.
$ LANG=nonexistent LC_ALL=nonexistent LANGUAGE=nonexistent hg version -q
Mercurial Distributed SCM (version *) (glob)