[TASK] Removes limit in outdated ext task

If it keeps in steps of 100 versions it
will run into a neverending task.

Task runs good without limit in my tests

Change-Id: I681fa7e13244fee2f01974e55fcad3a810a65615
Reviewed-on: https://review.typo3.org/29950
Reviewed-by: Tomas Norre Mikkelsen
Reviewed-by: Thomas Löffler
Tested-by: Thomas Löffler