Inverted ternary in peerlist_manager::filter() allows unlimited whitelist entries per host via different ports

`peerlist_manager::filter()` in `src/p2p/net_peerlist.h` has incorrect ternary that operates on the wrong peer list.

template<typename F> size_t peerlist_manager::filter(bool white, const F &f)
  {
    size_t filtered = 0;
    TRY_ENTRY();
    CRITICAL_REGION_LOCAL(m_peerlist_lock);
    peers_indexed::index<by_addr>::type& sorted_index = white ? m_peers_gray.get<by_addr>() : m_peers_white.get<by_addr>(); …