patch 8.2.5039: confusing error if first argument of popup_create() is wrong

Problem:    Confusing error if first argument of popup_create() is wrong.
Solution:   Give a more informative error.
diff --git a/src/version.c b/src/version.c
index cc97687..9e51afe 100644
--- a/src/version.c
+++ b/src/version.c
@@ -735,6 +735,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    5039,
+/**/
     5038,
 /**/
     5037,