Fix error on paste create via conduit

Summary: default policy to most liberal policy available for the installation

Test Plan: echo "sup man?" | arc paste   Was able to view resultant paste with no errors!

Reviewers: epriestley, vrana

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T1815

Differential Revision: https://secure.phabricator.com/D3548

src/applications/paste/conduit/ConduitAPI_paste_create_Method.php

@@ -70,6 +70,7 @@ final class ConduitAPI_paste_create_Method extends ConduitAPI_paste_Method {
     $paste->setLanguage($language);
     $paste->setFilePHID($paste_file->getPHID());
     $paste->setAuthorPHID($user->getPHID());
+    $paste->setViewPolicy(PhabricatorPolicies::POLICY_USER);
     $paste->save();
 
     $paste->attachContent($content);