feat: remove non-sticker heuristics and force_sticker()

This causes problems for Delta Chat Desktop at
<https://github.com/deltachat/deltachat-desktop/pull/6278>
even though the logic was originally introduced for iOS.
If the problem remains on iOS,
heuristics can be added into iOS UI.

deltachat-jsonrpc/src/api.rs

@@ -2379,9 +2379,6 @@ impl CommandApi {
         let mut msg = Message::new(Viewtype::Sticker);
         msg.set_file_and_deduplicate(&ctx, Path::new(&sticker_path), None, None)?;
 
-        // JSON-rpc does not need heuristics to turn [Viewtype::Sticker] into [Viewtype::Image]
-        msg.force_sticker();
-
         let message_id = deltachat::chat::send_msg(&ctx, ChatId::new(chat_id), &mut msg).await?;
         Ok(message_id.to_u32())
     }