[BootstrapAdminUi] Fall back to the default label and icon of the grid delete action

[Prometee]

Q	A
Branch?	main
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Related tickets	Backports Sylius/Sylius#19285
License	MIT

Problem

With symfony/ux-twig-component 3.5, an explicit null passed to a {% props %} prop no longer falls back to its default value.

The grid delete action passes action.label and action.icon directly to the sylius_bootstrap_admin_ui:delete_modal component. When these values are not configured, they are null, resulting in a missing delete icon, an empty tooltip, and an empty confirmation button label.

Fix

Apply explicit fallbacks in the shared grid delete action template, matching the component's defaults:

• Label: sylius.ui.delete
• Icon: tabler:trash-x

Custom labels and icons remain unchanged.

This backports the relevant fix from Sylius/Sylius#19285 to Sylius Stack, so applications using BootstrapAdminUi benefit from it directly, including those using Asset Mapper.