This pull request updates the `.weblate.json` files used for translating Odoo's Belgium Point of Sale (POS) modules. It ensures that all necessary modules are included for accurate translation, improving the user experience for customers using the system in Belgium. This is a routine maintenance update to support localization efforts.

Add missing modules in `.weblate.json` for translations of (l10n_be_pos_blackbox, l10n_be_pos_blackbox_hr, l10n_be_pos_blackbox_loyalty, l10n_be_pos_blackbox_self_order, l10n_be_pos_blackbox_settle_due)

These modules were added in this PR: https://github.com/odoo/enterprise/pull/96130