fix for 0005323: Possible infinite loop

• pass project_id to config_get to bypass project lookup (when called from
  helper_get_current_project()

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@3360 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9