[FEAT] Support alternate Flatpak launch parameters

[aclist]

Device type

Desktop PC

DZGUI version

6.0.0

Linux distribution

Arch Linux

Describe the feature

The preferred_client key is currently exposed as a binary toggle. In order to support the containerized version of flatpak, change this to a combobox with multiple options. See #241

Describe the benefit

Supports alternate Flatpak use cases where the application is sandboxed