strip trailing whitespaces

src/knot/ctl/remote.h

src/knot/dnssec/nsec-chain.c

src/knot/dnssec/nsec-chain.h

src/knot/dnssec/nsec3-chain.c

src/knot/dnssec/zone-nsec.c

src/knot/dnssec/zone-sign.c

src/knot/modules/synth_record.c

src/knot/nameserver/axfr.c

src/knot/nameserver/internet.c

src/knot/nameserver/ixfr.c

src/knot/nameserver/nsec_proofs.c

src/knot/nameserver/update.c

src/knot/server/zones.c

src/knot/updates/changesets.h

src/knot/updates/ddns.c

src/knot/updates/xfr-in.c

src/knot/zone/node.c

src/knot/zone/node.h

src/knot/zone/semantic-check.c

src/knot/zone/zone-contents.c