[Error] Prompted to enter the (root) password twice for exported applications when `root=true` (or `--root`)

**Describe the bug**
I've noticed that when I export a program into a root Distrobox, I'm prompted to enter the (root) password twice.
I understand being asked once, but the second time feels unnecessary and kind of annoying.


**To Reproduce**

Create one distrobox with `root=true` option (`distrobox.ini`):
```
[container]
name=test
image=quay.io/toolbx/ubuntu-toolbox:24.04
root=true
init=true
additional_packages=systemd
volume=~/.local/linuxbrew:/home/linuxbrew
```
`distrobox assemble create`

[Generated desktop file by 'distrobox-export --app codium'](https://github.com/user-attachments/files/19721679/development-codium.desktop.txt)

**Expected behavior**
The root password should only be requested once.

**Logs**
~Run the commands with `--verbose` and post the log here as a file upload
Attach also the output of `podman logs` or `docker logs`, possibly with `--latest` flag~

**Desktop:**
- Podman 5.4.2
- Distrobox 1.8.1.2
- Fedora Linux 41 Kinoite | KDE Plasma 6.3.4 | Linux kernel: 6.13.10-200.fc41.x86_64 | OSTree v41.20250411.0
- Distrobox installed with `rpm-ostree install distrobox`

Olhe o script distrobox-export, provavelmente em /usr/bin/distrobox-export ou no subcommand export do projeto. O bug ocorre ao exportar um app para um root container; rastreie onde sudo ou pkexec é chamado. Verifique se há authorization prompts duplicados na export logic. Teste exportando um app com o flag --root e veja de onde o segundo prompt se origina.

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