toFeathersRemoveHandler
function
FeathersJS's remove method returns the whole item back, when fixture.store's destroyData gives back only the given query (e.g. {id: 123}).
Find the item by id first, then remove from fixture.store and return the item back.
Feathers remove method emits 2 arguments with data: id and query. But we ignore 2nd data argument for now.