SurfaceFlinger: do not choose POWER_SAVING as refresh rate

    }

    // Content detection is on, find the appropriate refresh rate with minimal error

    auto iter = min_element(mRefreshRateConfigs.getRefreshRates().cbegin(),

                            mRefreshRateConfigs.getRefreshRates().cend(),

    auto begin = mRefreshRateConfigs.getRefreshRates().cbegin();

    // Skip POWER_SAVING config as it is not a real config

    if (begin->first == RefreshRateType::POWER_SAVING) {

        ++begin;

    }

    auto iter = min_element(begin, mRefreshRateConfigs.getRefreshRates().cend(),

                            [rate = mContentRefreshRate](const auto& l, const auto& r) -> bool {

                                return std::abs(l.second->fps - static_cast<float>(rate)) <

                                        std::abs(r.second->fps - static_cast<float>(rate));