fix off-by-one on the version restriction for dnssd

Summary: 5.54 had the fix, so anything greater 5.53 would do

Reviewers: broulik, ngraham

Reviewed By: ngraham

Subscribers: kde-frameworks-devel, kfm-devel

Tags: #dolphin, #frameworks

Differential Revision: https://phabricator.kde.org/D18981