Restore "Reply" action to Differential inline comments

Summary: Minor issue from D4117, user doesn't get passed down so inline comments are missing their "reply" link.

Test Plan: Looked at Differential, saw reply link.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D4145

src/applications/differential/parser/DifferentialChangesetParser.php

@@ -989,6 +989,10 @@ final class DifferentialChangesetParser {
       ->setMarkupEngine($this->markupEngine)
       ->setHandles($this->handles);
 
+    if ($this->user) {
+      $renderer->setUser($this->user);
+    }
+
     $shield = null;
     if ($this->isTopLevel && !$this->comments) {
       if ($this->isGenerated()) {