message: Use correct type for syncMempoolWithPeers tweak
diff: #include <random>
  extern CTxMemPool mempool;
  -extern CTweak<uint64_t> syncMempoolWithPeers;
  +extern CTweak<bool> syncMempoolWithPeers;
  extern CTweak<uint64_t> mempoolSyncMinVersionSupported;
  extern CTweak<uint64_t> mempoolSyncMaxVersionSupported;
  extern CCriticalSection cs_mempoolsync;
  