fix: TexturePacker fixes the wrong path for the atlas file.

[Yayo-Arellano]

Description

In this PR 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.

Checklist

• I have followed the Contributor Guide when preparing my PR.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples or docs.

Breaking Change?

• Yes, this PR is a breaking change.
• No, this PR is not a breaking change.

Related Issues

[Yayo-Arellano]

@ABausG Can you take a look this MR. It related to another MR you created here.

I think it was not breaking for you because you were overriding the images cache. One simple way to reproduce it is if you try to run the example folder, it will crash because cannot find the atlas_map.atlas under assets/

[spydon]

Lgtm

[Yayo-Arellano]

Thanks @spydon let's wait a while for @ABausG answer to the comment above, if my suspicions are right then we can merge, but if not then we need to find why it was not breaking for him when doing the implementation,

[spydon]

@Yayo-Arellano I think we can merge this, it's quite clear that the example can not have been working before. 😄