[vim/vim] mbyte: wrong cell count for an overlong UTF-8 sequence (PR #21005)

```
Problem:  An overlong UTF-8 encoding of an unprintable ASCII character is
          displayed as <xx> but counted as two screen cells, so that the
          cursor ends up in the wrong position when editing the line.
Solution: Count four cells for an unprintable overlong sequence.
```

fixes: #20988
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21005

-- Commit Summary --

  * mbyte: wrong cell count for an overlong UTF-8 sequence

-- File Changes --

    M src/mbyte.c (10)
    M src/testdir/test_utf8.vim (20)

-- Patch Links --

https://github.com/vim/vim/pull/21005.patch
https://github.com/vim/vim/pull/21005.diff

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