grpc: fix implicit QString conversions in setChannelStateGRPC.
grpc: fix implicit QString conversions in setChannelStateGRPC.

LuAPi/mumble,Lartza/mumble,SuperNascher/mumble,LuAPi/mumble,SuperNascher/mumble,LuAPi/mumble,Lartza/mumble,LuAPi/mumble,Lartza/mumble,SuperNascher/mumble,LuAPi/mumble,SuperNascher/mumble,LuAPi/mumble,Lartza/mumble,LuAPi/mumble,SuperNascher/mumble,Lartza/mumble,Lartza/mumble,SuperNascher/mumble,LuAPi/mumble,Lartza/mumble,SuperNascher/mumble,Lartza/mumble,SuperNascher/mumble,LuAPi/mumble,SuperNascher/mumble