Fix issue with entry_points when installing editable

[magnunor]

When trying to install HyperSpy + HyperSpy plotting extensions (traitsui and ipywidgets) in editable mode, there is an issue with the entry_points.

To replicate (only tested in Ubuntu 23.10):

• In a virtual environment in miniforge, first install "stable" HyperSpy (conda install hyperspy).
• Run in python terminal import hyperspy.api as hs (which works nicely)
• Then use pip3 install -e . in hyperspy_gui_ipywidgets project folder
• Run in python terminal import hyperspy.api as hs

This gives this error:

Specifically, it looks is the wrong folder:

FileNotFoundError: [Errno 2] No such file or directory: '/.../hyperspy_gui_ipywidgets/hyperspy-gui-ipywidgets/hyperspy_extension.yaml'

When it should look in (note the underscores): '/.../hyperspy_gui_ipywidgets/hyperspy_gui_ipywidgets/hyperspy_extension.yaml'

One way to fix this is by changing in pyproject.toml:

``python
hyperspy-gui-ipywidgets = "hyperspy_gui_ipywidgets"

to

```python
hyperspy_gui_ipywidgets = "hyperspy_gui_ipywidgets"

However, I am not sure how this will affect other installation methods.

---

Note: this also affects hyperspy_gui_traitsui in a similar way

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.01%. Comparing base (a36f81e) to head (de70b84).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #55   +/-   ##
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  Coverage   80.01%   80.01%           
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  Files           9        9           
  Lines        1216     1216           
  Branches      113      113           
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  Hits          973      973           
  Misses        228      228           
  Partials       15       15           

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