patch 8.2.0063: wrong size argument to vim_snprintf()

Problem:    Wrong size argument to vim_snprintf(). (Dominique Pelle)
Solution:   Reduce the size by the length. (related to #5410)
diff --git a/src/version.c b/src/version.c
index d40cb3b..79f9f7c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    63,
+/**/
     62,
 /**/
     61,