patch 9.0.0516: virtual text "above" highlights gap after it

Problem:    Virtual text "above" highlights gap after it.
Solution:   Do not highlight the gap. (closes #11138)
diff --git a/src/version.c b/src/version.c
index 9d26c3f..61555c1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    516,
+/**/
     515,
 /**/
     514,