Important: #36166 - Move access right parameters from BE to SYS configuration

See forge#36166

Description

The access permission parameters (fileCreateMask, folderCreateMask, createGroup) have been moved from $GLOBALS['TYPO3_CONF_VARS']['BE'] to $GLOBALS['TYPO3_CONF_VARS']['SYS']. An Upgrade Wizard ensures the correct migrations of the settings.