vim-patch:8.2.4579: cannot use page-up and page-down in the cmdline popup menu

Problem:    Cannot use page-up and page-down in the command line completion
            popup menu.
Solution:   Check for to page-up and page-down keys. (Yegappan Lakshmanan,
            closes vim/vim#9960)

5cffa8df7e

Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>

src/nvim/cmdexpand.h

@@ -19,8 +19,8 @@ enum {
   WILD_ALL_KEEP    = 8,
   WILD_CANCEL      = 9,
   WILD_APPLY       = 10,
-  // WILD_PAGEUP   = 11, not ported yet
-  // WILD_PAGEDOWN = 12, not ported yet
+  WILD_PAGEUP      = 11,
+  WILD_PAGEDOWN    = 12,
   WILD_PUM_WANT    = 13,
 };