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>
diff --git a/src/highlight.c b/src/highlight.c
index 6567035..807753a 100644
--- a/src/highlight.c
+++ b/src/highlight.c
@@ -249,6 +249,9 @@
 	 "TabLineSel term=bold cterm=bold gui=bold"),
     CENT("TabLineFill term=reverse cterm=reverse",
 	 "TabLineFill term=reverse cterm=reverse gui=reverse"),
+    "default link TabPanel TabLine",
+    "default link TabPanelSel TabLineSel",
+    "default link TabPanelFill TabLineFill",
 #ifdef FEAT_GUI
     "Cursor guibg=fg guifg=bg",
     "lCursor guibg=fg guifg=bg", // should be different, but what?