Fix data type of item when generating aspect ratios
fix: ensure $item is an asset before getting original aspect ratio (#22) Fixes a bug where a String (like a path) passed into the `wildcard` function would result in a type error. This was caused by the `getOriginalAspectRatio` call in `getFinalDimensions` because `$item` is never converted to an `AssetsAsset` (via `getAsset()`).