misc: don't immediately hex encode event commitment

keep it separate for now, since we're moving to more low level. We
probably won't even use this, but this is cleaner logicwise anyway.

damus/Models/HomeModel.swift

@@ -822,7 +822,7 @@ func process_metadata_profile(our_pubkey: String, profiles: Profiles, profile: P
 }
 
 func guard_valid_event(events: EventCache, ev: NostrEvent, callback: @escaping () -> Void) {
-    guard ev.id==calculate_event_id(ev: ev) else {
+    guard ev.id == hex_encode(calculate_event_id(ev: ev)) else {
         return
     }
     let validated = events.is_event_valid(ev.id)