[FIX] report: UPC-A barcodes drawing

It looks like reportlab doesn't handle well
UPC-A barcodes.

As UPC-A barcodes became EAN13 barcodes when
adding a `0` to the beginning of the barcode,
and the render is the same, we ask reportlab
a EAN13 barcode type when a UPC-A barcode is asked,
making sure to add the `0` automatically first.

From Wikipedia:
```
The EAN was developed as a superset of UPC,
adding an extra digit to the beginning of every UPC number.
[...]
the original rules for UPC are treated as a '0'
if read as EAN-13.
A UPC barcode XXXXXXXXXXXX therefore is the EAN-13 barcode 0XXXXXXXXXXXX.
It is possible to prefix a UPC barcode with a 0;
they become EAN-13 rather than UPC-A.
This does not change the check digit.
All point-of-sale systems can now understand both equally.
```
opw-670560

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