xrGame: Fix logic error in TransferMoney

Since both values are unsigned subtracting them from another will never
produce a negative value.

This bug was also present before the previous commit since the `money`
variable was implicitly converted to an `u32` resulting in the same bug.

src/xrGame/script_game_object_inventory_owner.cpp

@@ -486,7 +486,7 @@ void CScriptGameObject::TransferMoney(u32 money, CScriptGameObject* pForWho)
     CInventoryOwner* pOtherOwner = smart_cast<CInventoryOwner*>(&pForWho->object());
     VERIFY(pOtherOwner);
 
-    if (pOurOwner->get_money() - money < 0)
+    if (pOurOwner->get_money() < money)
     {
         GEnv.ScriptEngine->script_log(LuaMessageType::Error, "Character does not have enought money");
         return;