Fixed typo in path

t/Slave.t

 my $repo = SugarTrail::Repo->new(root => './t/data/strepo', vcs => 'git');
 
 my $data;
-$data->{mp} = $repo->load_stm(stm=>'/selftest/posititve/multiple_parameters.stm');
+$data->{mp} = $repo->load_stm(stm=>'/selftest/positive/multiple_parameters.stm');
 $data->{mw} = $repo->load_stm(stm=>'/selftest/negative/multiple_warnings.stm');
 
 ok($data->{mp}, "multiple_parameters: master is true");