patch 8.2.4829: a key may be simplified to NUL

Problem:    A key may be simplified to NUL.
Solution:   Use K_ZERO instead.  Use macros instead of hard coded values.
            (closes #10290)
diff --git a/src/version.c b/src/version.c
index 945b6a1..54f350b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4829,
+/**/
     4828,
 /**/
     4827,