Enh 0003564: In annonymous mode, login should remember the current page.

M core/html_api.php

• In anonymous mode, added the return address to the login link.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@2348 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9