`gp-address-autocomplete/gpaa-show-place-name.js`: Added change event when populating address field name.

[veryspry]

Context

⛑️ Ticket(s): https://secure.helpscout.net/conversation/2629624110/67745?folderId=6987275

Summary

Adds a change event emission so that the event gets propogated after the place name is set in the address field.

This was a suggestion from the customer and I think it makes sense as it may help avoid issues with the event not bubbling for anyone using this in the future.