Fixed double print of bill.

shop/receiptgenerator.cpp

@@ -152,7 +152,7 @@ QByteArray ReceiptGenerator::generate()
             QString name = item->name();
             QString price = QString::number(item->price().toDouble(), 'f', 2);
 
-            hasDoubleItem = name == shopSettings->doublePrintItem();
+            hasDoubleItem = hasDoubleItem || name == shopSettings->doublePrintItem();
 
             int numSpaces = 0;
             name = count + "x " + name;