[FIX] point_of_sale: receipt report, qty decimal precision

In the receipt report, the quantity decimal precision
was hardcoded to 0, while it should use the decimal
precision from the field definition.

opw-644507

addons/point_of_sale/views/report_receipt.xml

@@ -31,7 +31,7 @@
                             <td><span t-field="line.product_id"/></td>
                             <td class="text-right">
                                 <t t-if="o.state != 'cancel' and o.statement_ids">
-                                    <span t-esc="'%.f' % line.qty"/>
+                                    <span t-field="line.qty"/>
                                 </t>
                             </td>
                             <td class="text-right">