[BUGFIX] groupFor-VH does not work with @lazy

If you group an property with annotated @lazy option
f:groupedFor-ViewHelper can't group by this property.

Resolves: #52266
Releases: 6.2, 6.1, 6.0
Change-Id: Ie208b67eec8500fee87ee1c62b1bd348c0ed5598
Reviewed-on: https://review.typo3.org/24050
Reviewed-by: Xavier Perseguers
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters