Fix incorrect tile_latent_min_width calculation in AutoencoderKLMochi

[kuantuna]

What does this PR do?

This PR fixes an inconsistency in the calculation of tile_latent_min_width inside the AutoencoderKLMochi decoder.

Previously, tile_latent_min_width was incorrectly calculated using self.tile_sample_stride_width:

tile_latent_min_width = self.tile_sample_stride_width // self.spatial_compression_ratio

This led to a mismatch with the corresponding height calculation, which correctly used self.tile_sample_min_height. The corrected line now uses self.tile_sample_min_width.

This discrepancy did not raise errors under default settings (e.g., 848x480 resolution), but could cause incorrect conditional evaluations in edge cases, such as when profiling or testing different resolutions.

Fixes #11291.

Who can review?

@a-r-r-o-w

[a-r-r-o-w]

Awesome, thank you! 🎉

[HuggingFaceDocBuilderDev]

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[kuantuna]

Thanks for the review! Let me know if there's anything else needed from my side 🙌