M core/email_api.php

• $p_user_access_level was used instead of $t_user_access_level hence causing an undefined variable error. This was introduced during the one-email-per-user changes.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@2447 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9