refactor(messages): fold msg_outtrans_attr into msg_outtrans

problem: there are too many different functions in message.c
solution: fold some of the functions into themselves

src/nvim/buffer.c

@@ -2858,7 +2858,7 @@ void buflist_list(exarg_T *eap)
                    buf == curbuf ? (int64_t)curwin->w_cursor.lnum : (int64_t)buflist_findlnum(buf));
     }
 
-    msg_outtrans(IObuff);
+    msg_outtrans(IObuff, 0);
     line_breakcheck();
   }