Fix polygon confidence score

Closes #43 (closed)

dan/predict/attention.py

@@ -261,7 +261,7 @@ def get_polygon(
     metrics = [compute_contour_metrics(coverage_vector, cnt) for cnt in contours]
     confidences, scores = map(list, zip(*metrics))
     best_contour = contours[np.argmax(scores)]
-    confidence = round(confidences[np.argmax(scores)] / max_value, 2)
+    confidence = round(confidences[np.argmax(scores)], 2)
 
     # Format for JSON
     coord = polygon_to_bbx(np.squeeze(best_contour))