patch 8.1.2313: debugging where a delay comes from is not easy

Problem:    Debugging where a delay comes from is not easy.
Solution:   Use different values when calling ui_delay().
diff --git a/src/screen.c b/src/screen.c
index 8453c8d..edb93f8 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -2406,7 +2406,7 @@
 	    && emsg_silent == 0)
     {
 	out_flush();
-	ui_delay(1000L, TRUE);
+	ui_delay(1006L, TRUE);
 	emsg_on_display = FALSE;
 	if (check_msg_scroll)
 	    msg_scroll = FALSE;