Package layout fix

[talonchandler]

Fixes a installation problem introduced by #480.

Specifying [tool.setuptools.packages.find]; where = ["waveorder"] looks for a package named waveorder inside waveorder which was one too deep...leading to import issues.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.20%. Comparing base (34cdafb) to head (a060440).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #489      +/-   ##
==========================================
+ Coverage   46.13%   46.20%   +0.07%     
==========================================
  Files          50       50              
  Lines       10342    10367      +25     
==========================================
+ Hits         4771     4790      +19     
- Misses       5571     5577       +6     

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[srivarra]

Very odd that GHA tests passed for that one, but locally just trying to use the waveorder cli and napari plugins failed.

[srivarra]

As an aside, I did a quick test for converting the package from a flat-layout to a src-layout and it worked flawlessly (tests, opening napari with waveorder, etc...). So if at any point you'd like to move to that layout structure it'll be smooth.