Revert "Swap out frost-list-item component with mock component in integration test"
Revert "Swap out frost-list-item component with mock component in integration test"

This reverts commit 4f2205177bcf17e7abc5fbdea4feaa588f2031b4.

ciena-frost/ember-frost-list,ciena-frost/ember-frost-list,ciena-frost/ember-frost-list