update layer type check

[jmhauck]

The item.type === "Feature Layer" check seems questionable to me but leaving it for now since it's been like that for the last 5 years.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (2db5006) to head (331225b).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop     #1583   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          153       153           
  Lines         8652      8652           
  Branches      1999      1999           
=========================================
  Hits          8652      8652           

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