Completion menu shows history instead of command completions when using list layout.

Bug report form

• I have done a basic search of the issue tracker to find any existing issues that are similar.
• I have checked that my version is at least the latest stable release available via my installation method.

Describe the bug

If I set the completion_menu layout to list, pressing TAB displays my command history rather than command completion suggestions.

This is what I get when I enter cd and press TAB in my home directory, using layout: list:

✔ > cd
0: cd ~
1: cd /usr/bin
2: cd /usr
3: cd /tmp
4: cd /
5: cd ..
...

When I change layout: columnar I get directory suggestions (as expected):

✔ > cd
Desktop/
backup/
bin/
books/
build/
...

How to reproduce

• Add this config to config.nu:

$env.config.completions.sort = "smart"
$env.config.completions.algorithm = "fuzzy"

$env.config.menus ++= [{
    name: completion_menu
    only_buffer_difference: false
    type: {
        layout: list
    }
    marker: ""
    style: {
        text: white
        selected_text: red
        description_text: yellow
    }
}]

• Navigate to a directory that contains many subdirectories, for example: cd ~.

• Type cd (with a space) and press TAB.

  Instead of showing directory name completions, this displays the command history for cd.

• If you change the setting to layout: columnar and open a new terminal, completions are shown correctly.

Expected behavior

I expected to see directory name completions when pressing TAB after typing cd using layout: list.

Configuration

The issue names no files or tests. First reproduce the problem with the supplied config, then trace the completion-menu handling for list and columnar layouts; done means pressing TAB after cd with layout: list shows directory completions rather than command history.