fate/aliaspix: Use standard test sample

This also uses samples with odd resolution which should provide better coverage
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

tests/ref/fate/aliaspix-bgr

 #tb 0: 1/25
-0,          0,          0,        1,    36000, 0x9ff1ba55
+0,          0,          0,        1,    47637, 0xcb77368f

tests/ref/fate/aliaspix-gray

 #tb 0: 1/25
-0,          0,          0,        1,    12000, 0x29f8832c
+0,          0,          0,        1,    16119, 0x3d0785f5