patch 8.1.1806: test for display updating doesn't check without statusline

Problem:    Test for display updating doesn't check without statusline.
Solution:   Add screenshots without a status line.
diff --git a/src/version.c b/src/version.c
index e2ebd89..daf5e8b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -774,6 +774,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1806,
+/**/
     1805,
 /**/
     1804,