Required by net-im/tokodon.
Got a bit confused there, Plasma 6 and KDE Gear are only ~amd64 keyworded right now anyway so no hurry.
No problem with doing these whenever though, idea is to eventually restore keywords everywhere possible (unless we really don't want them like on qtwebengine or tests are completely broken), albeit for now I focused on packages that were blocking unmasking USE=qt6 only for the initial rekeyword sets that been done.