patch 8.1.1239: key with byte sequence containing CSI does not work

Problem:    Key with byte sequence containing CSI does not work.
Solution:   Do not recognize CSI as special unless the GUI is active. (Ken
            Takata, closes #4318)
diff --git a/src/version.c b/src/version.c
index f8a66a0..29a1f03 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1239,
+/**/
     1238,
 /**/
     1237,