Removed unused image open

[radarhere]

Pillow/Tests/test_file_ico.py

Lines 255 to 259 in aa0f412

	with Image.open(io.BytesIO(data)) as im:
	with Image.open("Tests/images/hopper_mask.png") as expected:
	assert im.mode == "1"
	# 32 bpp

The result of opening hopper_mask.png is not used here, so it can be removed.

You might think that we are testing just opening the image, but that has already been done earlier in the file.

Pillow/Tests/test_file_ico.py

Line 32 in aa0f412

assert_image_equal_tofile(im, "Tests/images/hopper_mask.png")