Restore defaults for nowikibooks bureaucrats

The "default" settings were found in bug 13853 and
were asked to be restored in bug 42105. Quite peculiar, it seems
$wgAddGroups and $wgRemoveGroups must have switched their
permissions groups somehow.

Bug: 42105
Change-Id: I1c99df65cab1064c69ee173222e073a96bf77a86