[FIX] product: _get_image_variant is used for the field `image`

This revision is related to 93d4db9d1e5ff7b1676b2f8a5392d8baf2afd79e.

Usually, for models with an image, the original `image` is stored
in the field `image`, and then the resized value are in the fields
`image_medium` & `image_small`.

In the specific case of the product variant, this is not the case,
the original image is stored in the field `image_variant`,
and the `image` field uses as well the method `_get_image_variant`.

The `image_get_resized_images` must therefore return the "big image"
as well, which is returned with the key `image`, by default.
This is done using the method argument `return_big`.

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