Issue 3522772: Add pager to admin subscriptions view, and other minor fixes

rclemingsrequested to merge
issue/user_mailman_register-3522772:3522772-add-pager-to into 1.0.x

Edit views.view.user_mailman_subscriptions.yml: Add a pager; add a filter to hide users with "unsubscribed" status, remove "unsubscribed" status from exposed filter options, remove remember_roles (exc. auth, anon, admin) from views.view.user_mailman_subscriptions.yml, multiple locations.

Closes #3522772

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