patch 8.0.1662: showing dump diff doesn't mention both file names

Problem:    Showing dump diff doesn't mention both file names.
Solution:   Add the file name in the separator line.
diff --git a/src/version.c b/src/version.c
index 87a326a..4b9761f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1662,
+/**/
     1661,
 /**/
     1660,