huffyuv: change statistics initialization
Normally, a Laplace distribution is more typical of the residuals
encoded, but for noisy input, it's both better and simpler to be
safe and use a 1/d^2 distribution. Second hunk could use some
renormalization but it has effectively little impact.
Output size of ffvhuff on various 4:2:0 sequences:
context=0,1/d: 851974 27226
1137281
context=0,1/d²: 619081 25069
1051500
context=0,1/d³: 501983 30454
1290561
context=0,lapl: 500650 31754
1304082
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>