fix: TexturePacker fixes the wrong path for the atlas file. (#3124)

In this [PR](#3103) we updated
the code to use `Flame.images` because of this change now the atlas file
and the sprite sheet both must be under the `assets/images/` directory.

Trying to run the example project will crash because the atlas find
cannot be found.

This MR fixes the problem by loading the `.atlas` file correctly from
the images directory.

Co-authored-by: Lukas Klingsbo <[email protected]>

packages/flame_texturepacker/lib/src/texture_packer_atlas.dart

@@ -101,7 +101,7 @@ Future<_TextureAtlasData> _parse(
   if (fromStorage) {
     fileAsString = await File(path).readAsString();
   } else {
-    fileAsString = await Flame.assets.readFile(path);
+    fileAsString = await Flame.assets.readFile('images/$path');
   }
 
   final iterator = LineSplitter.split(fileAsString).iterator;