patch 8.2.1210: using ht_used when looping through a hashtab is less reliable

Problem:    Using ht_used when looping through a hashtab is less reliable.
Solution:   Use ht_changed in a few more places.
diff --git a/src/version.c b/src/version.c
index f49eec9..6be113d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1210,
+/**/
     1209,
 /**/
     1208,