update: set MaxPacketMsgPayloadSize use MB unit (#2729)

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## Testing performed to validate your change

Author: blindchaser

sei-tendermint/config/config.go

@@ -702,7 +702,7 @@ func DefaultP2PConfig() *P2PConfig {
 		MaxConnections:                100,
 		MaxIncomingConnectionAttempts: 100,
 		FlushThrottleTimeout:          100 * time.Millisecond,
-		MaxPacketMsgPayloadSize:       1048576,
+		MaxPacketMsgPayloadSize:       1000000,
 		SendRate:                      20971520, // 20 MiB/s per connection
 		RecvRate:                      20971520, // 20 MiB/s per connection
 		PexReactor:                    true,