Batch prediction don't squeeze outputs when using batched points or boxes

[geodavic]

Fixes the issue described here: #101

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[geodavic]

Now when you pass a singleton batch of points or boxes, the resulting mask shape will reflect that:

>>> predictor.set_image(image)
>>> point_coords.shape # Singleton batch
(1, 2, 2)
>>> masks, _ , _ = predictor.predict(point_coords=point_coords, point_label=point_labels)
>>> masks.shape
(1, 3, 1200,1800)

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