Drop two unused dependencies
Original commit message(s)
- Drop unused KPipeWire dependency
The cameraindicator autotest is included if the KPipeWire target is found, but actually links to pipewire only, not KPipeWire. So match the condition with the usage.
- Drop unused QCoro6DBus dependency
No longer needed after b93c04d8.
Test plan
Built and ran the tests.