updating dummyaccelerator in test

  const std::string name() const override { return "dummy"; }

  const std::string description() const override { return ""; }

  void initialize(const HeterogeneousMap &params = {}) override { return; }

  std::vector<std::shared_ptr<IRTransformation>>

  getIRTransformations() override {

    return {};

  }

  void execute(std::shared_ptr<xacc::AcceleratorBuffer> buf,

               std::shared_ptr<xacc::CompositeInstruction> f) override {}

  void execute(std::shared_ptr<AcceleratorBuffer> buffer,