[FIX] website_slides: prevent content overflow outside the window

When the user adds the "Title" or "Certificate" in a large number of
characters, the content goes beyond the window.

Technical:
By using this class it applies width 100%, which resolves the issue.

Now, the content stays within the sheet.

Task-3368902

closes odoo/odoo#129014

X-original-commit: 44720aa6e7080ce849af329d8c92681489e093fb
Signed-off-by: Warnon Aurélien (awa) <awa@odoo.com>

addons/website_slides/static/src/slide_category_one2many_field.js

@@ -22,4 +22,5 @@ SlideCategoryOneToManyField.defaultProps = {
 registry.category("fields").add("slide_category_one2many", {
     ...x2ManyField,
     component: SlideCategoryOneToManyField,
+    additionalClasses: [...x2ManyField.additionalClasses || [], "o_field_one2many"],
 });