Add a member list expandable to the lobby. Fix issue with hosting more than once.

src/citra_qt/multiplayer/client_room.cpp

@@ -96,6 +96,8 @@ void ClientRoomWindow::Disconnect() {
     if (auto member = Network::GetRoomMember().lock()) {
         member->Leave();
         ui->chat->AppendStatusMessage(tr("Disconnected"));
+        close();
+        emit Closed();
     }
 }