`muse_gui` fails if launched as a script

[dalonsoa]

MUSE-GUI fails if launched as muse_gui after having done pip install -e .[gui]. If it is launched with python -m muse_gui, it works fine. The command line version of MUSE works in both case.

In summary, this works:

• muse
• python -m muse
• python -m muse_gui
• muse.exe (if using standalone version)
• muse_gui.exe (if using standalone version)

This does not work:

• muse_gui

Originally posted by @dalonsoa in https://github.com/SGIModel/MUSE_OS/issues/152#issuecomment-1678488785