fix: Generate new pre-message Message-ID when forwarding

Otherwise if it's forwarded to a device that already has the original
message, the pre-message isn't received and this results in a message
having no text and `Forwarded` param.

Co-authored-by: Hocuri <hocuri@gmx.de>

src/chat.rs

@@ -4539,6 +4539,7 @@ pub async fn forward_msgs_2ctx(
 
         msg.state = MessageState::OutPending;
         msg.rfc724_mid = create_outgoing_rfc724_mid();
+        msg.pre_rfc724_mid.clear();
         msg.timestamp_sort = curr_timestamp;
         chat.prepare_msg_raw(ctx_dst, &mut msg, None).await?;