Remove taint mode from critic test.

[plicease]

I am not sure what the -T should be necessary for this test, and I get this
error with it:

t/critic.t ............ Insecure dependency in chdir while running with -T switch at /home/ollisg/perl5/perlbrew/perls/perl-5.29.3/lib/5.29.3/File/Find.pm line 375.
t/critic.t ............ Dubious, test returned 2 (wstat 512, 0x200)

While I was in here, I also added stopwords to the POD which was preventing the test from passing.

#   Failed test 'Test::Perl::Critic for "lib/Test/PerlTidy.pm"'
#   at /home/ollisg/.perlbrew/libs/perl-5.29.3@dev/lib/perl5/Test/Perl/Critic.pm line 121.
# 
#   Check the spelling in your POD: Hmmm perltidy cvs perltidyrc subdirectories listref canonified pre von der Leszczynski perl at line 1, near 'package Test::PerlTidy;'.
#   Documentation::PodSpelling (Severity: 1)
#     Did you write the documentation? Check.