[FIX] website: decrease moving blocks speed by 35%

When moving blocks up and down, the speed has been decreased by 35%, as
it was too fast for the user before.

Part of https://github.com/odoo/odoo/pull/68823
task-2446852

X-original-commit: cbbaa74fe15efd19e0614d984247995af9a64247

addons/website/static/src/js/editor/snippets.options.js

@@ -2714,6 +2714,7 @@ options.registry.SnippetMove = options.Class.extend({
             dom.scrollTo(this.$target[0], {
                 extraOffset: 50,
                 easing: 'linear',
+                duration: 550,
             });
         }
     },