[FIX] point_of_sale: do not strip name on backend report

The max size of 20 is for the pos ticket which has a limited size.
Strip on client side to keep the full name for the pdf report.
opw-691483

addons/point_of_sale/models/pos_order.py

@@ -819,7 +819,7 @@ class ReportSaleDetails(models.AbstractModel):
             'taxes': taxes.values(),
             'products': sorted([{
                 'product_id': product.id,
-                'product_name': product.name[:20],
+                'product_name': product.name,
                 'code': product.default_code,
                 'quantity': qty,
                 'price_unit': price_unit,

addons/point_of_sale/static/src/xml/pos.xml

@@ -864,7 +864,7 @@
             <div class='orderlines' line-ratio='0.6'>
                 <t t-foreach='products' t-as='line'>
                     <line>
-                        <left><t t-esc='line.product_name' /></left>
+                        <left><t t-esc='line.product_name.substr(0,20)' /></left>
                         <right>
                             <value value-decimals='2' value-autoint='on'>
                                 <t t-esc='line.quantity' />