patch 8.2.2814: Vim9: unused variable

Problem:    Vim9: unused variable. (John Marriott)
Solution:   Adjust #ifdef.
diff --git a/src/version.c b/src/version.c
index aea6465..d1ece11 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2814,
+/**/
     2813,
 /**/
     2812,