patch 8.2.3763: when editing the cmdline a callback may cause a scroll up

Problem:    When editing the command line a FocusLost callback may cause the
            screen to scroll up.
Solution:   Do not redraw at the last line but at the same place where the
            command line was before. (closes #9295)

src/terminal.c

@@ -1258,7 +1258,7 @@ write_to_term(buf_T *buffer, char_u *msg, channel_T *channel)
 		update_cursor(curbuf->b_term, TRUE);
 	}
 	else
-	    redraw_after_callback(TRUE);
+	    redraw_after_callback(TRUE, FALSE);
     }
 }