src: remove useless initialization of WALK_LIST* counters

src/contrib/ucw/lists.c

src/knot/common/stats.c

src/knot/conf/module.c

src/knot/ctl/commands.c

src/knot/events/handlers/refresh.c

src/knot/events/handlers/update.c

src/knot/events/replan.c

src/knot/nameserver/internet.c

src/knot/nameserver/nsec_proofs.c

src/knot/nameserver/process_query.c

src/knot/nameserver/query_module.c

src/knot/server/server.c

src/knot/server/tcp-handler.c

src/knot/server/udp-handler.c

src/knot/zone/zone.c

src/utils/common/tls.c

src/utils/kdig/kdig_exec.c

src/utils/kdig/kdig_params.c

src/utils/knsupdate/knsupdate_exec.c

src/utils/knsupdate/knsupdate_params.c