patch 8.2.0470: Test_confirm_cmd_cancel() can fail on a slow system

Problem:    Test_confirm_cmd_cancel() can fail on a slow system.
Solution:   Use WaitForAssert(). (Ozaki Kiichi, closes #5861)
diff --git a/src/version.c b/src/version.c
index 8bf06a1..954a751 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    470,
+/**/
     469,
 /**/
     468,