$TCA[<table>]['ctrl']['shadowColumnsForMovePlaceholders'] behaves
similar to shadowColumnsForNewPlaceholders but is only used for
move placeholders.

If shadowColumnsForMovePlaceholders is not defined in particular
for a table, but shadowColumnsForNewPlaceholders is defined,
then that value is used as a fallback - since that property
existed for a longer time already.

Resolves: #56994
Documentation: #56749
Releases: 6.2
Change-Id: Icdbd35234efae8162cfb2dc15a2838acd22370b1
Reviewed-on: https://review.typo3.org/28473
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader