patch 9.0.1069: diff mode highlight fails for special characters

Problem:    Diff mode highlight fails for special characters.
Solution:   Adjust condition for setting "diff_hlf".
diff --git a/src/version.c b/src/version.c
index b9755be..89d7152 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1069,
+/**/
     1068,
 /**/
     1067,