patch 8.2.1282: Vim9: crash when using CheckScriptFailure()

Problem:    Vim9: crash when using CheckScriptFailure() in
            Test_vim9script_call_fail_decl().
Solution:   Do not decrement the def_functions len unless the function was
            newly added.
diff --git a/src/version.c b/src/version.c
index 4286eb0..4ef3051 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1282,
+/**/
     1281,
 /**/
     1280,