patch 8.2.3439: deleted lines go to wrong yank register

Problem:    Deleted lines go to wrong yank register.
Solution:   Reset y_append when not calling get_yank_register(). (Christian
            Brabandt, closes #8872)
diff --git a/src/version.c b/src/version.c
index c803e5b..47afced 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3439,
+/**/
     3438,
 /**/
     3437,