App bug fix.

app.py

@@ -115,7 +115,7 @@ def plot_results(pil_img, prob, boxes):
     
     for p, (xmin, ymin, xmax, ymax) in zip(prob, boxes.tolist()):
         cl = p.argmax()
-        c = int(colors[cl])
+        c = colors[cl]
         c1, c2 = (int(xmin), int(ymin)), (int(xmax), int(ymax))
 
         cv2.rectangle(img, c1, c2, c, thickness=2, lineType=cv2.LINE_AA)