storage_proxy: fix cl achieved condition in digest resolver timeout handler
storage_proxy: fix cl achieved condition in digest resolver timeout handler

In digest resolver for cl to be achieved it is not enough to get correct
number of replies, but also to have data reply among them. The condition
in digest timeout does not check that, fortunately we have a variable
that we set to true when cl is achieved, so use it instead.

Message-Id: <2fd34ab3a5153afb521a85018eab8ce2584411fd@scylladb.com>

scylladb/scylla,duarten/scylla,duarten/scylla,avikivity/scylla,raphaelsc/scylla,raphaelsc/scylla,raphaelsc/scylla,scylladb/scylla,avikivity/scylla,kjniemi/scylla,duarten/scylla,scylladb/scylla,kjniemi/scylla,scylladb/scylla,kjniemi/scylla,avikivity/scylla