patch 8.1.0924: terminal scrollback test still flaky

Problem:    Terminal scrollback test still flaky.
Solution:   Wait a bit longer before running the tail command.
diff --git a/src/version.c b/src/version.c
index bb5e0e1..10715ac 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    924,
+/**/
     923,
 /**/
     922,