patch 8.2.2469: confusing error if :winsize has a wrong argument

Problem:    Confusing error if :winsize has a wrong argument.
Solution:   Quote the argument in the error. (closes #2523)
diff --git a/src/version.c b/src/version.c
index e8c286b..fb3a50a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2469,
+/**/
     2468,
 /**/
     2467,