Stop exposing raw "accountID" values directly in the web UI

Summary:
Ref T13493. The "AuthAccountView" UI element currently exposes raw account ID values, but I'm trying to make these many-to-one.

This isn't terribly useful as-is, so get rid of it. This element could use a design refresh in general.

Test Plan: Viewed the UI element in "External Accounts".

Maniphest Tasks: T13493

Differential Revision: https://secure.phabricator.com/D21010

src/applications/auth/view/PhabricatorAuthAccountView.php

···
       $use_name = $username;
     } else if (strlen($realname)) {
       $use_name = $realname;
-    } else {
-      $use_name = $account->getAccountID();
     }
 
     $content[] = phutil_tag(
···
       ),
       array(
         $prov_name,
-        " \xC2\xB7 ",
-        $account->getAccountID(),
       ));
 
     $account_uri = $account->getAccountURI();