fix: Adjust GenerateUnoSplash targets to have proper inputs for better incrementality

[Youssef1313]

Fixes: #293

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[Youssef1313]

@dansiegel Can you please review?

[dansiegel]

While I agree with the premise, the timing isn't great for this. Resizetizer has a habit of being fragile and unless we have a specific issue that we can really test for I'd like to avoid making any changes until we're ready to do a larger scale update.