[vim/vim] Vim9: assignment to a member of an object member fails (PR #21085)

```
Problem:  Using an operator on a member of an object that is itself a
          member of an object gives E909, and a plain assignment to it
          stores the value in the wrong member.
Solution: When the last index is split off from the name, forget the
          member index found for the first name.  The index is compiled
          before the variable, thus do not use the type that loading the
          variable produced.  Load the member of an object like an
          expression does instead of indexing it.
```

fixes: #21084
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21085

-- Commit Summary --

  * Vim9: assignment to a member of an object member fails

-- File Changes --

    M src/proto/vim9expr.pro (1)
    M src/testdir/test_vim9_class.vim (61)
    M src/vim9compile.c (21)
    M src/vim9expr.c (2)

-- Patch Links --

https://github.com/vim/vim/pull/21085.patch
https://github.com/vim/vim/pull/21085.diff

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