fix(maturin): remove python-source to fix wheel structure

Author: burdettadam

python/pyproject.toml

@@ -113,5 +113,3 @@ bindings = "uniffi"
 manifest-path = "../rust/Cargo.toml"
 # Python module name (must use underscores, not hyphens)
 module-name = "isomdl_uniffi"
-# Include the Python package source files in the wheel
-python-source = "."