only initiate subscriptions for new relays added with read:true

pool.js

@@ -84,9 +84,11 @@ export function relayPool() {
       })
       relays[relayURL] = {relay, policy}
 
+      if (policy.read) {
         Object.values(activeSubscriptions).forEach(subscription =>
           subscription.addRelay(relay)
         )
+      }
 
       return relay
     },