[vim/vim] 'scrolloffpad', scroll-down on the last line does scroll-up (Issue #21096)

gx089 created an issue (vim/vim#21096)

### Steps to reproduce

Ok this could potentialy a bug:
```vim
:set scrolloff=999
:set scrolloffpad=1
```
When cursor is on the last line of the buffer (moved manually), `<C-d>` performs an upward scroll like `<C-u>` with the corresponding `vim.opt.scroll`
A better behavior in this case would be that `<C-d` does nothing.

Bug see: https://github.com/neovim/neovim/issues/41383



### Expected behaviour

`<C-d>` on the last line (with the settings above) should do nothing.

### Version of Vim

vim-patch:9.2.0356

### Environment

-

### Logs and stack traces

```shell

```

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