patch 8.1.0996: a few screendump tests fail because of scrolling

Problem:    A few screendump tests fail because of scrolling.
Solution:   Update the screendumps.
diff --git a/src/version.c b/src/version.c
index 70a43d5..e1c8c61 100644
--- a/src/version.c
+++ b/src/version.c
@@ -780,6 +780,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    996,
+/**/
     995,
 /**/
     994,