patch 8.2.3708: Vim9: test fails with different error

Problem:    Vim9: test fails with different error.
Solution:   Correct the error number.
diff --git a/src/testdir/test_vim9_cmd.vim b/src/testdir/test_vim9_cmd.vim
index 57796b6..45e4fb0 100644
--- a/src/testdir/test_vim9_cmd.vim
+++ b/src/testdir/test_vim9_cmd.vim
@@ -282,8 +282,7 @@
       elseif 'text'
       endif
   END
-  CheckDefFailure(lines, 'E1012:', 3)
-  CheckScriptFailure(['vim9script'] + lines, 'E1135:', 4)
+  CheckDefAndScriptFailure(lines, 'E1135:', 3)
 
   lines =<< trim END
       if g:cond