patch 8.1.1427: popup window screenshot test fails

Problem:    Popup window screenshot test fails.
Solution:   Add missing change to popup window code.
diff --git a/src/version.c b/src/version.c
index 0420cb6..282d045 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1427,
+/**/
     1426,
 /**/
     1425,