region: Update CcInputChooser GTK+ code

- Move more code into the .ui file
- Don't save the dialog between runs - it's cheap to generate on demand
- Hold references on data passed to dialog
- Connect signals in "swapped" form
- Use standard naming format for signal callbacks
11 jobs for region-input-chooser-widget in 4 minutes and 11 seconds (queued for 2 seconds)
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