Fix a typo in ManiphestTaskQuery

Summary: This doesn't have any impact on anything right now (we don't persist the query) but could in the future, so I just left it as-is but fixed the typo.

Test Plan: looked at it carefully

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: WikiChad, epriestley

Differential Revision: https://secure.phabricator.com/D9155

src/applications/maniphest/query/ManiphestTaskQuery.php

@@ -445,7 +445,7 @@ final class ManiphestTaskQuery
     // In doing a fulltext search, we first find all the PHIDs that match the
     // fulltext search, and then use that to limit the rest of the search
     $fulltext_query = id(new PhabricatorSavedQuery())
-      ->setEngineClassName('PhabricatorSearchApplicaionSearchEngine')
+      ->setEngineClassName('PhabricatorSearchApplicationSearchEngine')
       ->setParameter('query', $this->fullTextSearch);
 
     // NOTE: Setting this to something larger than 2^53 will raise errors in