patch 9.0.0169: insufficient testing for line2byte() with text properties

Problem:    Insufficient testing for line2byte() with text properties.
Solution:   Add tests with a lot of text.
diff --git a/src/version.c b/src/version.c
index 2f34ffe..3660eb7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    169,
+/**/
     168,
 /**/
     167,