Failure to handle non square textures for the auto character atlasing.

[GuiltyRegicide]

Describe the bug If a VRM is uploaded with non - square resolution textures, those textures fail to load properly.

To Reproduce 1: create avatar with more then one material, and have it be non 1:1 ratio. 2: upload the character into webaverse by the drag n drop method. 3: observe the textures being incorrectly displayed on the model.

Expected behavior The auto atlas feature should be able to handle arbitrary texture sizes.

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