[core] Refresh acc timeout beat each time a tx is added (#3331)

Signed-off-by: Daniel Van Der Maden <dvandermaden0@berkeley.edu>

core/tx_pool.go

@@ -967,6 +967,9 @@ func (pool *TxPool) add(tx types.PoolTransaction, local bool) (bool, error) {
 		pool.priced.Put(tx)
 		pool.journalTx(from, tx)
 
+		// Set or refresh beat for account timeout eviction
+		pool.beats[from] = time.Now()
+
 		logger.Info().
 			Str("hash", tx.Hash().Hex()).
 			Interface("from", from).
@@ -993,6 +996,9 @@ func (pool *TxPool) add(tx types.PoolTransaction, local bool) (bool, error) {
 	}
 	pool.journalTx(from, tx)
 
+	// Set or refresh beat for account timeout eviction
+	pool.beats[from] = time.Now()
+
 	logger.Info().
 		Str("hash", hash.Hex()).
 		Interface("from", from).