patch 8.0.0356: leaking memory when setting 'ttytype'

Problem:    Leaking memory when setting 'ttytype'.
Solution:   Get free_oldval from the right option entry.
diff --git a/src/version.c b/src/version.c
index 64e1111..94a325b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    356,
+/**/
     355,
 /**/
     354,