fix: restore $status before calling __fish_prompt_orig

[fstanis]

This fixes #4650 and is more aligned with how conda behaves.

[tdejager]

Can't seem to figure out how this behavior differs from main. Can you maybe paste the original and modified terminal outputs? I also use tide and never noticed something strange :)

[fstanis]

The current code calls __fish_prompt_orig right after __pixi_add_prompt. This means that if __fish_prompt_orig reads $status, it will be the return status of __pixi_add_prompt.

In practice this means something like tide never displays the status code, i.e. it's supposed to look like this (notice 127 on the right):

While pixi is active, I never get any code displayed on the right.

[tdejager]

Ah yeah I see! Ok lets merge!

[Hofer-Julian]

Thanks @fstanis!