fix an issue where rejected message requests will come back on linked devices

Session/Conversations/ConversationVC+Interaction.swift

@@ -1249,12 +1249,16 @@ extension ConversationVC {
                     
                     // Delete all thread content
                     self?.thread.removeAllThreadInteractions(with: transaction)
-                    self?.thread.remove(with: transaction)
                 },
                 completion: { [weak self] in
                     // Force a config sync and pop to the previous screen
                     MessageSender.syncConfiguration(forceSyncNow: true).retainUntilComplete()
                     
+                    // Remove the thread after the config message is sent.
+                    // Otherwise the blocked user won't be included in the
+                    // config message.
+                    self?.thread.remove()
+                    
                     DispatchQueue.main.async {
                         self?.navigationController?.popViewController(animated: true)
                     }