runtime(vim): Add support for <ScriptCmd> syntax (vim/vim#10686)
Adding `<ScriptCmd>` to list of angle-bracket notation syntax, just like `<Cmd>`
`<Cmd>` is already highlighted.
```vim
nnoremap <leader>o <Cmd>Oldfiles()<CR>
```
`<ScriptCmd>` is not.
80beeef0c6
Co-authored-by: dezza <402927+dezza@users.noreply.github.com>