Changing the weights of the first CRF filter in deringing

The old taps were equivalent to [2 2 3 2 3 2 2], while the new taps are
equivalent to [1 2 3 4 3 2 1].

ntt-short results:
         MEDIUM (%) HIGH (%)
    PSNR -0.072101 -0.218669
 PSNRHVS  0.031113 -0.060644
    SSIM  0.007458 -0.171469
FASTSSIM -0.156346 -0.130445

Change-Id: I699862d6a4246986a0d880df26a57b7a28623ce3