[qt] Display more helpful message when adding a send address has failed
When we're unable to add a sending address to the address book because it
already exists as a receiving address, display a message indicating as much.
This should help avoid confusion about an address supposedly already in the
book but which isn't currently visible in the interface.
/** Return a descriptive string when adding an already-existing address fails. */
QString getDuplicateAddressWarning() const;
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