dashboard: hand over a token reading the member list only

Review finding 8, second part: opening another member's dashboard
handed it a token reading everything (READ_ALL). A member writes its
own dashboard URL, so a malicious one received a read-everything token
under the operator's identity: /admin/config, /admin/changes,
/admin/log and the rest, on every node the user reaches.

The token handed over now reads the member list only (READ_MEMBERS, as
sent to subscribed nodes), which is enough to draw the map; the user
logs in at the other dashboard to see more. With 1151 it lasts five
minutes and isn't refreshed past them.

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