don't pass the g_ portion of the config variable name into the configapi... it isn't part of the config option name... still display the $g portion in the error for now

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1389 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9