message: cli: small -netinfo simplification and performance improvement
  that removes code and particularly this code from the loop of all peers:
  `m_is_i2p_on |= (network_id == NET_I2P);`
diff: @@ -300,7 +300,6 @@ class NetinfoRequestHandler : public BaseRequestHandler
  {
  private:
  static constexpr int8_t UNKNOWN_NETWORK{-1};
  - static constexpr int8_t NET_I2P{3}; // pos of "i2p" in m_networks
  static constexpr uint8_t m_networks_size{4};
  static constexpr uint8_t MAX_DETAIL_LEVEL{4};
  const std::array<std::string, m_networks_size> m_networks{{"ipv4", "ipv6", "onion", "i2p"}};
  @@ -319,7 +318,6 @@ private:
  bool IsAddressSelected() const { return m_details_level == 2 || m_details_level == 4; }
  bool IsVersionSelected() const { return m_details_level == 3 || m_details_level == 4; }
  bool m_is_asmap_on{false};
  - bool m_is_i2p_on{false};
  size_t m_max_addr_length{0};
  size_t m_max_age_length{3};
  size_t m_max_id_length{2};
  @@ -404,7 +402,6 @@ public:
  const std::string network{peer["network"].get_str()};
  const int8_t network_id{NetworkStringToId(network)};
  if (network_id == UNKNOWN_NETWORK) continue;
  - m_is_i2p_on |= (network_id == NET_I2P);
  const bool is_outbound{!peer["inbound"].get_bool()};
  const bool is_block_relay{!peer["relaytxes"].get_bool()};
  const std::string conn_type{peer["connection_type"].get_str()};
  @@ -477,13 +474,14 @@ public:
  // Report peer connection totals by type.
  result += " ipv4 ipv6 onion";
  - if (m_is_i2p_on) result += " i2p";
  + const bool any_i2p_peers = m_counts.at(2).at(3); // false if total i2p peers count is 0, otherwise true
  + if (any_i2p_peers) result += " i2p";
  result += " total block";
  if (m_manual_peers_count) result += " manual";
  const std::array<std::string, 3> rows{{"in", "out", "total"}};
  for (uint8_t i = 0; i < 3; ++i) {
  result += strprintf("\n%-5s %5i %5i %5i", rows.at(i), m_counts.at(i).at(0), m_counts.at(i).at(1), m_counts.at(i).at(2)); // ipv4/ipv6/onion peers counts
  - if (m_is_i2p_on) result += strprintf(" %5i", m_counts.at(i).at(3)); // i2p peers count
  + if (any_i2p_peers) result += strprintf(" %5i", m_counts.at(i).at(3)); // i2p peers count
  result += strprintf(" %5i", m_counts.at(i).at(m_networks_size)); // total peers count
  if (i == 1) { // the outbound row has two extra columns for block relay and manual peer counts
  result += strprintf(" %5i", m_block_relay_peers_count);
  