bloom_filter: no need for a unique_ptr
bloom_filter: no need for a unique_ptr

I actually wrote this code before I learned that we could just return a local
vector by copy without major hassles.

Never too late for a cleanup.

Signed-off-by: Glauber Costa <f8b79557d19b40666ebe336545a0b6178af65685@cloudius-systems.com>

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