Never create mvbox when configuring a new transport

Author: link2xt

src/configure.rs

@@ -577,7 +577,7 @@ async fn configure(ctx: &Context, param: &EnteredLoginParam) -> Result<Option<&'
     ctx.sql.set_raw_config("mvbox_move", Some("0")).await?;
     ctx.sql.set_raw_config("only_fetch_mvbox", None).await?;
 
-    let create_mvbox = !is_chatmail;
+    let create_mvbox = false;
     imap.configure_folders(ctx, &mut imap_session, create_mvbox)
         .await?;