CTeam: use HaveResources() in UseResources()

No logic change, but ensures that calling the former
can always accurately predict the success of the latter.

rts/Sim/Misc/Team.cpp

@@ -192,7 +192,7 @@ void CTeam::AddResources(SResourcePack amount, bool useIncomeMultiplier)
 
 bool CTeam::UseResources(const SResourcePack& amount)
 {
-	if (!(res >= amount))
+	if (!HaveResources(amount))
 		return false;
 
 	res -= amount;