woeusbgui fails on nixos

[aarmn]

Good Habit Checklist for Issue Reporting

• I've searched the issue tracker and is pretty sure that there's no duplicate issue already filed
• I've built the latest development snapshot using the instructions in README and verified that the issue can still be reproduced (for bug reports)

Issue Reproduce Instructions

1. run woeusbgui

Expected Behavior

No error

Current Behavior

The value for the SHELL variable was not found in the /etc/shells file

This incident has been reported.

Info of My Environment

WoeUSB Version

0.2.12

WoeUSB Source

Installed from NixOS unstable repos, updated some days ago

Information about the Operating System

I'm running the program in a nix-shell session, my main user shell is fish, but root and nix-shell default session is bash