Fix 0003020: Error when deleting a bug.

M core/bugnote_api.php

• (bugnote_delete_all): $result variable was overwritten by another query.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@2062 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9