Fix regression in user link display for feedback (Bug #1085569)

In cleanurls commit 0d28fabc the
item object rather than the author id was passed to the profile_url
method.

Change-Id: I0cf818e57171d63bd07eee372fbacc7accf787ca

htdocs/artefact/comment/lib.php

@@ -494,7 +494,7 @@ class ArtefactTypeComment extends ArtefactType {
                         'admin'         => $item->admin,
                         'deleted'       => $item->deleted,
                         'profileicon'   => $item->profileicon,
-                        'profileurl'    => profile_url($item),
+                        'profileurl'    => profile_url($item->author),
                     );
                 }
             }