WeightedProduct always returns zero

[ItsDoot]

This should have an initial value of one, not zero:

big-brain/src/measures.rs

Lines 33 to 39 in db1509d

	impl Measure for WeightedProduct {
	fn calculate(&self, scores: Vec<(&Score, f32)>) -> f32 {
	scores
	.iter()
	.fold(0f32, |acc, (score, weight)| acc * score.0 * weight)
	}
	}