[BUGFIX] Wrong colspan in DatabaseRecordList

If the List Module is in extended view, the colspan of the footer
is wrong if there are more than 20 records of a type.

Fix this by increasing the colspan with one if the List Module is
extended view.

Resolves: #55443
Releases: 6.2
Change-Id: I4c9a45cdab3d1c5267566663fbb6c7cbb702f32a
Reviewed-on: https://review.typo3.org/27448
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters