Revert "Fixes #6030 - Hide group bookmarklet from non-members"

This reverts commit 5a6b259a320256c2f75828193aa8da93eebe226e.

The commit will be added to 1.8 branch instead.
Merge pull request #6194 from juho-jaakkola/revert_group_bookmarklet

Revert "Fixes #6030 - Hide group bookmarklet from non-members"