refact resize_mode

[thiagofloriano]

No description provided.

[brenogazzola]

Cria um teste no variable_test por favor. Eu obviamente esqueci quando eu acrescentei o resize_mode como atributo

[brenogazzola]

Pode ser simples:

blob = create_file_blob(filename: "dog.jpg", content_type: "image/jpg", metadata: { analyzed: true, width: 1401, height: 2102, white_background: white_background })
image = VitalsImage::Optimizer::Variable.new(blob, width: width, height: height, resize_mode: BLABLABLA)
assert_equal BLABLABLA, image.send(:resize_mode)
end