uuid: fix serialization of least significant bytes
uuid: fix serialization of least significant bytes

Shift amount was incorrect.

eklitzke/scylla,stamhe/scylla,raphaelsc/scylla,rentongzhang/scylla,avikivity/scylla,tempbottle/scylla,capturePointer/scylla,bowlofstew/scylla,linearregression/scylla,kangkot/scylla,kjniemi/scylla,eklitzke/scylla,raphaelsc/scylla,aruanruan/scylla,bowlofstew/scylla,victorbriz/scylla,avikivity/scylla,kangkot/scylla,dwdm/scylla,scylladb/scylla,kjniemi/scylla,linearregression/scylla,phonkee/scylla,rluta/scylla,eklitzke/scylla,scylladb/scylla,justintung/scylla,wildinto/scylla,justintung/scylla,justintung/scylla,respu/scylla,scylladb/scylla,phonkee/scylla,scylladb/scylla,raphaelsc/scylla,duarten/scylla,duarten/scylla,gwicke/scylla,acbellini/scylla,rentongzhang/scylla,gwicke/scylla,capturePointer/scylla,guiquanz/scylla,senseb/scylla,guiquanz/scylla,tempbottle/scylla,tempbottle/scylla,bowlofstew/scylla,duarten/scylla,capturePointer/scylla,stamhe/scylla,wildinto/scylla,acbellini/scylla,phonkee/scylla,respu/scylla,kjniemi/scylla,asias/scylla,senseb/scylla,senseb/scylla,rluta/scylla,glommer/scylla,aruanruan/scylla,shaunstanislaus/scylla,dwdm/scylla,gwicke/scylla,aruanruan/scylla,glommer/scylla,victorbriz/scylla,asias/scylla,asias/scylla,respu/scylla,stamhe/scylla,victorbriz/scylla,shaunstanislaus/scylla,glommer/scylla,wildinto/scylla,dwdm/scylla,avikivity/scylla,guiquanz/scylla,kangkot/scylla,rentongzhang/scylla,shaunstanislaus/scylla,linearregression/scylla,rluta/scylla,acbellini/scylla