`gpep-edit-entry.php`: Fixed snippet to update entry on submit.

[saifsultanc]

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Context

⛑️ Ticket(s): https://secure.helpscout.net/conversation/2057441367/40322?folderId=7098280#thread-6158158999

Summary

The conditional field if it got hidden/removed due to an update in the entry on Edit Entry had it's value still retained. The entry object was getting updated to remove the value. This update fires a update_entry on submit, to ensure the entry is completely updated.