Fix debug assertion in create_labels

[Wumpf]

What

glam on debug now notices that what we have here is a perspective transform. We actually don't quite care about the perspective divide here, but this fixes the issue and still has the correct label ordering (just to be sure I checked with the spiral of labels generated by the old test_api script)

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[Wumpf]

I need this, merging without review because it's so trivial