patch 9.1.1391: Vim does not have a vertical tabpanel

Problem:  Vim does not have a tabpanel
Solution: include the tabpanel feature
          (Naruhiko Nishino, thinca)

closes: #17263

Co-authored-by: thinca <thinca@gmail.com>
Signed-off-by: Naruhiko Nishino <naru123456789@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/netbeans.c

@@ -1747,6 +1747,9 @@ nb_do_cmd(
 	    {
 		check_status(buf->bufp);
 		redraw_tabline = TRUE;
+#if defined(FEAT_TABPANEL)
+		redraw_tabpanel = TRUE;
+#endif
 		maketitle();
 		update_screen(0);
 	    }