geoparam - raster size

[ecasellas]

There is an error in check_variable in field_size order, it should be:

geo_param = np.array(
    [
        self.field_geotransform,
        self.field_proj.ExportToWkt(),
        self.field_size[1],
        self.field_size[0],
    ],
    dtype="object",
)

This previously passed the tests because x and y size were the same.