Use a smaller TIFF file as fixture

[ershad]

Summary

Reduced the size of TIFF fixture file from 33.7MB to 729KB

Other Information

It's being used only in the following test case. It doesn't need a large TIFF file.

rails/activestorage/test/models/variant_test.rb

Lines 144 to 153 in 5fa6841

	test "resized variation of TIFF blob" do
	blob = create_file_blob(filename: "racecar.tif")
	variant = blob.variant(resize: "50x50").processed
	assert_match(/racecar\.png/, variant.service_url)
	image = read_image(variant)
	assert_equal "PNG", image.type
	assert_equal 50, image.width
	assert_equal 33, image.height
	end

[kaspth]

Thanks! 🏎