dashboard: no subscription to this node itself

A page opened from another node's page takes that page's subscriptions
along; one of them can be this node, another there. The page then
followed this node as a subscribed one too, and showed its messages
twice, from its own log and from the subscription (`→ LLL PING` and
`LLL ← RRR PING`, the same message), on the map as in the console.

The page follows no subscription of its own node: not when it knows
which node it is, and one begun before that stops once it does; its
messages, if any came, are left out.

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