revert(cluster): keep the filter selections across restarts

They were made session-only on a misreading: the ask was about the FIRST launch
of a fresh install, not every launch. Restored as they were — restored on
reopen, and travelling with a copied data/ folder.

A first-ever launch already starts with nothing filtered: every selection
defaults to empty or off and there is no code that switches one on. The one
route by which a new installation can come up filtered is a copied data/ folder,
which carries the previous machine's selections by design.

The filtered-out message and the clear-every-filter button stay: they are what
makes a filter that IS set visible, whenever it was set.

changelog.json

@@ -6,14 +6,12 @@
       "WinKeyer: the opening probe goes out as one write, matching a capture of a client that talks to the same K3NG keyer, and the handshake bytes are always logged so a keyer that stays silent can be diagnosed.",
       "DX cluster: when spots arrive and every one is filtered out, the panel says so, names the filters doing it and offers to clear them — it used to say “waiting for spots” beside a counter reading 76 live.",
       "DX cluster: the log times the connection and the first spot, so a slow first launch can be told apart from a quiet node.",
-      "DX cluster: filters now start off at every launch — a band lock left on from a previous session hid every spot.",
       "Generic HTTP relay: its URLs were never actually sent — fixed. Adds {value} and {relay-1}, https, and no host or test needed."
     ],
     "fr": [
       "WinKeyer : la sonde d’ouverture part en un seul envoi, calquée sur la capture d’un client qui dialogue avec le même manipulateur K3NG, et les octets de la poignée de main sont toujours journalisés pour diagnostiquer un manipulateur muet.",
       "Cluster DX : quand des spots arrivent et que tout est filtré, le panneau le dit, nomme les filtres responsables et propose de les effacer — il affichait « en attente de spots » à côté d’un compteur à 76 en direct.",
       "Cluster DX : le journal chronomètre la connexion et le premier spot, pour distinguer un premier lancement lent d’un nœud silencieux.",
-      "Cluster DX : les filtres démarrent désactivés à chaque lancement — un verrou de bande oublié masquait tous les spots.",
       "Relais HTTP générique : ses URL n’étaient jamais envoyées — corrigé. Ajoute {value} et {relay-1}, https, sans hôte ni test."
     ]
   },