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.

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1210,
 /**/
     1209,
 /**/