patch 9.1.0476: Cannot see matched text in popup menu

Problem:  Cannot see matched text in popup menu
Solution: Introduce 2 new highlighting groups: PmenuMatch and
          PmenuMatchSel (glepnir)

ping @habamax, @neutaaaaan @romainl because vim/colorschemes may need
some updates, @lifepillar for updating vim-colortemplate

closes: #14694

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/highlight.c b/src/highlight.c
index 9aa149f..a71a100 100644
--- a/src/highlight.c
+++ b/src/highlight.c
@@ -258,6 +258,8 @@
     "default link CurSearch Search",
     "default link PmenuKind Pmenu",
     "default link PmenuKindSel PmenuSel",
+    "default link PmenuMatch Pmenu",
+    "default link PmenuMatchSel PmenuSel",
     "default link PmenuExtra Pmenu",
     "default link PmenuExtraSel PmenuSel",
     CENT("Normal cterm=NONE", "Normal gui=NONE"),