sstables: fix typo in compaction code
sstables: fix typo in compaction code

s/estimated_parititions/estimated_partitions

Signed-off-by: Raphael S. Carvalho <1e2942cea40e3b4d2162dfcd9e53e41c05a84d22@cloudius-systems.com>

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