fix(backup)_: dont generate a CR if the synced contact is mutual

Fixes status-im/status-desktop#15849

The problem was that we generated a "fake" contact request for all synced contacts.
While it's true that even mutual contacts have a contact request, we don't need it anymore once mutual and since we don't sync messages, we had to generate it with a default message and that message looked very out of place after a recovery.

protocol/messenger_contacts.go

@@ -601,6 +601,7 @@ func (m *Messenger) generateContactRequest(clock uint64, timestamp uint64, conta
 	contactRequest := common.NewMessage()
 	contactRequest.ChatId = contact.ID
 	contactRequest.WhisperTimestamp = timestamp
+	contactRequest.Timestamp = timestamp
 	contactRequest.Seen = true
 	contactRequest.Text = text
 	if outgoing {

protocol/messenger_handler.go

@@ -478,6 +478,10 @@ func (m *Messenger) handleCommandMessage(state *ReceivedMessageState, message *c
 }
 
 func (m *Messenger) syncContactRequestForInstallationContact(contact *Contact, state *ReceivedMessageState, chat *Chat, outgoing bool) error {
+	if contact.mutual() {
+		// We only need to generate a contact request if we are not mutual
+		return nil
+	}
 
 	if chat == nil {
 		return fmt.Errorf("no chat restored during the contact synchronisation, contact.ID = %s", contact.ID)