[FIX] product: price list reports with too many fractional digits

Before this commit, when printing the Price List report of a Product
Variant, the price is printed directly from the float result of the
calculation of the price, even if this price is rounded, the
representation of the float can have, sometimes, float precision errors
(a lot of 0 after the decimal point, and a 1 or 2 at the end).

Now, the function returns a string formatted to the correct number of
fractional digits.

opw-2069305

closes odoo/odoo#36705

closes odoo/odoo#36770

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/product/report/product_pricelist_templates.xml

@@ -53,9 +53,9 @@
                                 </td>
                                 <t t-foreach="data['quantities']" t-as="quantity">
                                     <td><strong t-esc="categ_data['prices'][product.id][quantity]"
-                                                t-esc-options="{
-                                                    'widget': 'monetary',
-                                                    'display_currency': data['pricelist'].currency_id}"/>
+                                                t-options="{
+                                                    'widget': 'float',
+                                                    'decimal_precision': 'Product Price'}"/>
                                     </td>
                                 </t>
                             </tr>