fix(style): fix variable name (lower camelcase)

www/class/centreon-clapi/centreonACLAction.class.php

www/class/centreon-clapi/centreonACLGroup.class.php

www/class/centreon-clapi/centreonACLMenu.class.php

www/class/centreon-clapi/centreonACLResource.class.php

www/class/centreon-clapi/centreonCentbrokerCfg.class.php

www/class/centreon-clapi/centreonCommand.class.php

www/class/centreon-clapi/centreonContact.class.php

www/class/centreon-clapi/centreonContactGroup.class.php

www/class/centreon-clapi/centreonDowntime.class.php

www/class/centreon-clapi/centreonEngineCfg.class.php

www/class/centreon-clapi/centreonHost.class.php

www/class/centreon-clapi/centreonHostCategory.class.php

www/class/centreon-clapi/centreonHostGroup.class.php

www/class/centreon-clapi/centreonHostGroupService.class.php

www/class/centreon-clapi/centreonLDAP.class.php

www/class/centreon-clapi/centreonObject.class.php

www/class/centreon-clapi/centreonResourceCfg.class.php

www/class/centreon-clapi/centreonService.class.php

www/class/centreon-clapi/centreonServiceCategory.class.php

www/class/centreon-clapi/centreonServiceGroup.class.php