Remove _t suffix from struct names

src/common-knot/ref.h

src/knot/conf/conf.h

src/knot/ctl/remote.c

src/knot/nameserver/query_module.c

src/knot/nameserver/query_module.h

src/knot/server/dthreads.h

src/knot/server/journal.h

src/knot/server/rrl.h

src/knot/server/server.c

src/knot/server/server.h

src/knot/updates/acl.c

src/knot/updates/acl.h

src/knot/zone/contents.h

src/knot/zone/events/events.c

src/knot/zone/events/events.h

src/knot/zone/zone.h

src/knot/zone/zonedb-load.c

src/knot/zone/zonedb-load.h

src/knot/zone/zonefile.h

src/libknot/internal/errors.h