[FIX] website_sale_wishlist, js: add to cart qty

The selector used for finding the qty field is simply 'qty', which is useless
in most cases.

While there is actually no quantity input in a wishlist template, it could be
leveraged by extension modules.

Support for same markup as found in product page seems appropriate:
input[name="add_qty"]

closes odoo/odoo#33224

Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>

addons/website_sale_wishlist/static/src/js/website_sale_wishlist.js

@@ -138,7 +138,7 @@ var ProductWishlist = Widget.extend({
         // can be hidden if empty
         $('#my_cart').removeClass('hidden');
         website_sale_utils.animate_clone($('#my_cart'), tr, 25, 40);
-        return this.add_to_cart(product, tr.find('qty').val() || 1);
+        return this.add_to_cart(product, tr.find('input[name="add_qty"]').val() || 1);
     },
     wishlist_mv: function(e){
         var tr = $(e.currentTarget).parents('tr');
@@ -146,7 +146,7 @@ var ProductWishlist = Widget.extend({
 
         $('#my_cart').removeClass('hidden');
         website_sale_utils.animate_clone($('#my_cart'), tr, 25, 40);
-        var adding_deffered = this.add_to_cart(product, tr.find('qty').val() || 1);
+        var adding_deffered = this.add_to_cart(product, tr.find('input[name="add_qty"]').val() || 1);
         this.wishlist_rm(e, adding_deffered);
         return adding_deffered;
     },