[CLEANUP] Remove duplicated Xclass code

Remove the duplicated Xclass code from the current
DatabaseRecordList Xclass. Remove the lines, that
are the same as in the original class.

Change-Id: Ie24c8517c7a4f34bcccbee871c8c1d16bad2868c
Reviewed-on: https://review.typo3.org/31035
Reviewed-by: Jo Hasenau
Tested-by: Jo Hasenau