Fixed typo in function

[bjarketol]

Fixed typo bug

• File: wifa/pywake_api.py:96
• Changed np.suyamlFilem(sample_weight) → np.sum(sample_weight)
• This was a critical bug that would cause a runtime error if weighted_quantile() was ever called

Removed redundant deflection model check

• File: wifa/pywake_api.py:766-767
• Removed the redundant elif deflection_model_data["name"] == "None" block
• This was already covered by the .lower() == "none" check above it

Fixes #37