core: display any fork warning at startup too

This is a good time for the operator to be around and see it

src/cryptonote_core/cryptonote_core.h

@@ -783,7 +783,7 @@ namespace cryptonote
      cryptonote_protocol_stub m_protocol_stub; //!< cryptonote protocol stub instance
 
      epee::math_helper::once_a_time_seconds<60*60*12, false> m_store_blockchain_interval; //!< interval for manual storing of Blockchain, if enabled
-     epee::math_helper::once_a_time_seconds<60*60*2, false> m_fork_moaner; //!< interval for checking HardFork status
+     epee::math_helper::once_a_time_seconds<60*60*2, true> m_fork_moaner; //!< interval for checking HardFork status
      epee::math_helper::once_a_time_seconds<60*2, false> m_txpool_auto_relayer; //!< interval for checking re-relaying txpool transactions
 
      friend class tx_validate_inputs;