[vim/vim] Vim9: internal error when a class member is initialized with a closure (PR #21081)

```
Problem:  Initializing an object variable with a closure gives an internal
          error when the constructor is called without arguments.
Solution: Do not use "any" as the type of an argument that was not set, and
          do not copy such an argument when the stack is copied for a
          closure.
```

fixes: #21069
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21081

-- Commit Summary --

  * Vim9: internal error when a class member is initialized with a closure

-- File Changes --

    M src/testdir/test_vim9_class.vim (17)
    M src/vim9execute.c (10)

-- Patch Links --

https://github.com/vim/vim/pull/21081.patch
https://github.com/vim/vim/pull/21081.diff

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