[TASK] Simplify TYPO3_DB->cleanIntArray

Instead of iterating over the array and calling "intval" for each
element the "array_map" php function gets used.

Change-Id: I5ae699f9bc158eb0caebf1fc9ea8ebaa3cdd73ca
Resolves: #56738
Releases: 6.2, 6.1, 6.0
Reviewed-on: https://review.typo3.org/28234
Reviewed-by: Dmitry Dulepov
Tested-by: Dmitry Dulepov
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn