patch 8.2.2532: Vim9: confusing error if :k is used with a range

Problem:    Vim9: confusing error if :k is used with a range.
Solution:   Give an error about the range. (issue #7874)

src/testdir/test_vim9_script.vim

@@ -3497,6 +3497,11 @@ def Test_unsupported_commands()
   END
   CheckDefAndScriptFailure(lines, 'E1100:')
 
+  lines =<< trim END
+      :1ka
+  END
+  CheckDefAndScriptFailure(lines, 'E481:')
+
   lines =<< trim END
     t
   END