performance: don't spam nip05 validation on startup

Since we don't show these on events anymore, we don't need to spam nip05
validation. We can just check when we go to the profile page

Changelog-Fixed: Eliminate nostr address validation bandwidth on startup

damus/Nostr/Profiles.swift

@@ -40,6 +40,12 @@ class Profiles {
         }
     }
 
+    func invalidate_nip05(_ pk: String) {
+        validated_queue.async(flags: .barrier) {
+            self.validated.removeValue(forKey: pk)
+        }
+    }
+
     func set_validated(_ pk: String, nip05: NIP05?) {
         validated_queue.async(flags: .barrier) {
             self.validated[pk] = nip05