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Describe the bug
e2ac35b has introduced a default prompt for fish shell. However, since the function is defined in a configure file, fish shell always load the function and ignore the user-provided autoloaded function fish_prompt, which is usually defined $XDG_CONFIG_HOME/fish/functions/fish_prompt.fish.

To Reproduce
have a fish_prompt.fish with the function defined in it.
launch distrobox with fish shell

Expected behavior
The prompt should be what the user defined, not the default prompt like

📦[$USER@$CONTAINER_ID $CURRENT_DIR]> 

Desktop (please complete the following information):
Aeon
podman version 5.3.2
distrobox: 1.8.0
preinstalled distro package