patch 8.1.1722: error when scriptversion is 2 a making a dictionary access

Problem:    Error when scriptversion is 2 a making a dictionary access.
Solution:   Parse the subscript even when not evaluating the sub-expression.
            (closes #4704)
diff --git a/src/version.c b/src/version.c
index 4d27065..36a7779 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1722,
+/**/
     1721,
 /**/
     1720,