Raise $wgRateLimit for rollback for editors on dewiki

This patch raises $wgRateLimit for the 'rollback' action
for the 'editor' user group on the German Wikipedia per
community consensus, from the current 10 actions per
60 seconds to 100 actions per 60 seconds, as is the
case with the 'rollbacker' user group.

See bug for URL with on-wiki agreement for the change
(26 users in favour vs 14 against, 65% support).

Bug: 57820
Change-Id: Ie4d57f0bf4dca8bcb302d74f851416661e98bdc8