Use slug in generator tag instead of plugin name

[westonruter]

See WordPress/performance#1103

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.83%. Comparing base (f930d5c) to head (b077403).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #174      +/-   ##
==========================================
- Coverage   91.60%   86.83%   -4.78%     
==========================================
  Files           6        6              
  Lines         524      524              
==========================================
- Hits          480      455      -25     
- Misses         44       69      +25     

Flag	Coverage Δ
default	86.83% <ø> (ø)
integration	86.83% <ø> (-4.78%)	⬇️
multisite	86.83% <ø> (-4.78%)	⬇️
trunk	?
unit	?

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