Replace old GetState and SetState calls

966727b52e made the player state an enum and introduced more descriptive
functions to achieve the same thing, but it seems they were forgotten to
be replaced in a few places, which this patch fixes.

source/ps/Game.cpp

@@ -495,7 +495,7 @@ bool CGame::IsGameFinished() const
 	for (const std::pair<entity_id_t, IComponent*>& p : m_Simulation2->GetEntitiesWithInterface(IID_Player))
 	{
 		CmpPtr<ICmpPlayer> cmpPlayer(*m_Simulation2, p.first);
-		if (cmpPlayer && cmpPlayer->GetState() == "won")
+		if (cmpPlayer && cmpPlayer->HasWon())
 			return true;
 	}