patch 8.0.1393: too much highlighting with 'hlsearch' and 'incsearch' set

Problem:    Too much highlighting with 'hlsearch' and 'incsearch' set.
Solution:   Do not highlight matches when the pattern matches everything.
diff --git a/src/version.c b/src/version.c
index ab1f816..4b18f63 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1393,
+/**/
     1392,
 /**/
     1391,