Conditionally remove leftover qt5 dependencies from KDE Connect

As of network/kdeconnect-kde!630 (merged), kpeoplevcard is no longer needed in KDE Connect. (Due to being merged into KPeople for KF6).

I don't know what happened to QtQuickControls 🙂, but I built with Qt6, packaged, installed, and tested locally and it seems fine without them.

Update the craft blueprint to reflect this new reality.