fix: Cross-account forwarding of a message which has_html() (#7791)

This includes forwarding of long messages. Also this fixes sending, but more likely resending of
forwarded messages for which the original message was deleted, because now we save HTML to the db
immediately when creating a forwarded message.

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

src/message.rs

@@ -980,7 +980,7 @@ impl Message {
 
     /// Returns true if the message is a forwarded message.
     pub fn is_forwarded(&self) -> bool {
-        0 != self.param.get_int(Param::Forwarded).unwrap_or_default()
+        self.param.get_int(Param::Forwarded).is_some()
     }
 
     /// Returns true if the message is edited.