Use "Best" URI when linking to files from Maniphest file previews

Summary: Previously, this code accidentally did not use the best URI. Instead,
use the best URI. It's the best, obviously.

Test Plan: Uploaded a binary file and then clicked the preview.

Reviewers: hunterbridges, jungejason, nh, tuomaspelkonen, aran

Reviewed By: tuomaspelkonen

CC: aran, tuomaspelkonen

Differential Revision: 905

src/view/layout/filepreview/AphrontFilePreviewView.php

@@ -41,7 +41,7 @@ final class AphrontFilePreviewView extends AphrontView {
     $link = phutil_render_tag(
       'a',
       array(
-        'href'    => $file->getViewURI(),
+        'href'    => $file->getBestURI(),
         'target'  => '_blank',
       ),
       $img);