pidgin/pidgin

Remove now-unused PurpleXferUiOps.destroy.

2019-12-22, Elliott Sales de Andrade
d26ef8ea193f
Remove now-unused PurpleXferUiOps.destroy.

UI data is stored on GObjects and automatically destroyed, so this isn't
really needed as a UI op for *our* UIs. There will be a replacement soon
if needed by other UIs.
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