patch 8.2.2397: Vim9: "%%" not seen as alternate file name for ":bdel"

Problem:    Vim9: "%%" not seen as alternate file name for commands with a
            buffer name argument.
Solution:   Recognize "%%" like "#". (closes #7732)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2397,
 /**/
     2396,
 /**/