patch 8.2.0438: terminal noblock test is very flaky on BSD

Problem:    Terminal noblock test is very flaky on BSD.
Solution:   Change WaitFor() to WaitForAssert() to be able to see why it
            failed.  Add a short wait in between sending keys.
diff --git a/src/version.c b/src/version.c
index eef374a..82d93e5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    438,
+/**/
     437,
 /**/
     436,