Remove leftover reference to `scale_box` (#31)

ppdet/data/transform/operators.py

@@ -1032,7 +1032,6 @@ class Resize(BaseOperator):
         scale_x = dim / w
         scale_y = dim / h
         if 'gt_bbox' in sample and len(sample['gt_bbox']) > 0:
-            if self.scale_box or self.scale_box is None:
             scale_array = np.array([scale_x, scale_y] * 2,
                                    dtype=np.float32)
             sample['gt_bbox'] = np.clip(