M core/database_api.php

• (db_key_exists_on_field) Fixed two cases where the index used to access table description array were undefined (under Windows / IIS the defined array entries were 'field' not 'Field', and 'key' not 'Key').

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@2453 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9