patch 8.2.3397: no test for what 8.2.3391 fixes

Problem:    No test for what 8.2.3391 fixes.
Solution:   Add a test. (Yegappan Lakshmanan, closes #8828)
diff --git a/src/version.c b/src/version.c
index 3708e8f..8aaf163 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3397,
+/**/
     3396,
 /**/
     3395,