Don't pass data to jshint via STDIN

Summary: Fixes T7464. JSHint is unable to exclude files from linting (via the jshintignore file) if the data is piped through STDIN. An alternative would be to pass $options[] = '--filename='.$this->getActivePath(), but $this->getActivePath() is not set when the command arguments are constructed.

Test Plan: Created a file and linted it with ArcanistJSHintLinter. Was able to exclude the file from linting with a jshintignore file.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T7464

Differential Revision: https://secure.phabricator.com/D12298