Update core/model/modx/processors/system/config_check.inc.php

MODx currently checks if register_globals is on incorrectly by only
looking for the value TRUE or FALSE however PHP.ini allows values to be
entered as TRUE, 1, YES, FALSE, NO, 0
Fix invalid ini boolean evaluation in config_check processor
Fix invalid ini boolean evaluation in config_check processor

Merge branch 'fix-configchk-ini' into release-2.2

* fix-configchk-ini:
  Fix invalid ini boolean evaluation in config_check processor
  Update core/model/modx/processors/system/config_check.inc.php