use SNPLAYER_OTHERS (#3117)

Source/multi.cpp

@@ -488,7 +488,7 @@ void NetSendHiPri(int playerId, const byte *data, size_t size)
 		msgSize = sync_all_monsters(lowpriBody, msgSize);
 		size_t len = gdwNormalMsgSize - msgSize;
 		pkt.hdr.wLen = len;
-		if (!SNetSendMessage(-2, &pkt.hdr, len))
+		if (!SNetSendMessage(SNPLAYER_OTHERS, &pkt.hdr, len))
 			nthread_terminate_game("SNetSendMessage");
 	}
 }
@@ -729,7 +729,7 @@ bool NetInit(bool bSinglePlayer)
 		gbSomebodyWonGameKludge = false;
 		nthread_send_and_recv_turn(0, 0);
 		SetupLocalPositions();
-		SendPlayerInfo(-2, CMD_SEND_PLRINFO);
+		SendPlayerInfo(SNPLAYER_OTHERS, CMD_SEND_PLRINFO);
 
 		auto &myPlayer = Players[MyPlayerId];
 		ResetPlayerGFX(myPlayer);