`gpeb-filter-with-default-value.php`: Added snippet to load Entries Block with a provided default value on a filter.

[saifsultanc]

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Context

⛑️ Ticket(s): https://secure.helpscout.net/conversation/2565332084/64616?folderId=3808239

Summary

Setup default value for a filter in the Filters block.

Applied the wp_safe_redirect logic as on core we do when we manually "apply" a filter (here)