Correct bad context path when doing pattern search inside a repository
Summary:
Ref PHI101. It looks like this was maybe copy/pasted by mistake in recent design refactoring.
We need to pass the full path, not the `basename()` of the path, to the search form.
Test Plan: Searched inside `scripts/test/`, found results inside `scripts/test/`.
Reviewers: amckinley
Reviewed By: amckinley
Differential Revision: https://secure.phabricator.com/D18664