feed: fix too many subscriptions

fetch profile meta data only for future notes for pubkeys that are
not known of if the event kind is a text note, but not for reactions
or meta data.

this drastically reduces one time subscriptions.

src/subscriptions.ts

@@ -59,6 +59,12 @@ export const sub24hFeed = (onEvent: SubCallback) => {
   sub({
     cb: (evt, relay) => {
       onEvent(evt, relay);
+      if (
+        evt.kind !== 1
+        || pubkeys.has(evt.pubkey)
+      ) {
+        return;
+      }
       subOnce({ // get profil data
         relay,
         cb: onEvent,