[FIX] point_of_sale: characters overlap in the receipt with html2canvas

Some characters were overlapped in the printed receipt or receipt sent by email because the library html2canvas doesn't handle well the css wrapping (e.g. in the German localization) by default.

closes odoo/odoo#73594

X-original-commit: debab4026f4f4bf380cba3bcb65c223cc4e1bbc9
Signed-off-by: pimodoo <pimodoo@users.noreply.github.com>

addons/point_of_sale/static/src/js/printers.js

@@ -102,7 +102,8 @@ var PrinterMixin = {
                 onrendered: function (canvas) {
                     $('.pos-receipt-print').empty();
                     resolve(self.process_canvas(canvas));
-                }
+                },
+                letterRendering: true,
             })
         });
         return promise;