Fix setting edge attributes when the attribute name is set.

[nwlandry]

Fixes #480.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (536f592) 92.03% compared to head (6bc4c4b) 92.05%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #481      +/-   ##
==========================================
+ Coverage   92.03%   92.05%   +0.02%     
==========================================
  Files          60       60              
  Lines        4392     4392              
==========================================
+ Hits         4042     4043       +1     
+ Misses        350      349       -1     

Files	Coverage Δ
xgi/core/hypergraph.py	93.54% <100.00%> (ø)

... and 1 file with indirect coverage changes

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