[vim/vim] screen: fill char with a zero low byte is stored as a NUL cell (PR #20960)

```
Problem:  Using a multibyte fill character whose lower byte is zero, such
          as U+2500 for a popup border or 'fillchars', stores a NUL in
          ScreenLines[].  That marks the cell as the right half of a
          double-width character, and the GUI reports E340 when the window
          is resized (iranoan).
Solution: Store 0x80 instead of the truncated character code, like
          fold_line() already does.
```

fixes: https://github.com/vim-jp/issues/issues/1460 (Japanese)
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20960

-- Commit Summary --

  * screen: fill char with a zero low byte is stored as a NUL cell

-- File Changes --

    M src/screen.c (2)

-- Patch Links --

https://github.com/vim/vim/pull/20960.patch
https://github.com/vim/vim/pull/20960.diff

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