[bot] Implement WorldPlayerAdd(...)

* Rename `CNetGame::sub_415EC0(...)` to `CNetGame::SetPlayerAdded(...)`

bot/net/playerpool.cpp

@@ -32,7 +32,7 @@ CPlayerPool::~CPlayerPool()
 BOOL CPlayerPool::Delete(PLAYERID playerId, BYTE byteReason)
 {
 	m_bPlayerSlotState[playerId] = FALSE;
-	pNetGame->sub_415EA0(playerId, FALSE);
+	pNetGame->SetPlayerAdded(playerId, FALSE);
 	return TRUE;
 }