patch 8.2.2387: runtime type check does not mention argument index

Problem:    Runtime type check does not mention argument index.
Solution:   Add ct_arg_idx. (closes #7720)
diff --git a/src/testdir/test_vim9_disassemble.vim b/src/testdir/test_vim9_disassemble.vim
index 1aab9d5..f40bcf0 100644
--- a/src/testdir/test_vim9_disassemble.vim
+++ b/src/testdir/test_vim9_disassemble.vim
@@ -934,7 +934,7 @@
         'return Ref(g:value)\_s*' ..
         '\d LOADG g:value\_s*' ..
         '\d LOAD $0\_s*' ..
-        '\d CHECKTYPE number stack\[-2\]\_s*' ..
+        '\d CHECKTYPE number stack\[-2\] arg 1\_s*' ..
         '\d PCALL (argc 1)\_s*' ..
         '\d RETURN',
         instr)