patch 9.0.1301: virtual text below empty line not displayed

Problem:    Virtual text below empty line not displayed.
Solution:   Adjust flags and computations. (closes #11959)
diff --git a/src/version.c b/src/version.c
index f28cfd8..524abf7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1301,
+/**/
     1300,
 /**/
     1299,