gui: Throttle GUI update pace when -reindex
gui: Throttle GUI update pace when -reindex

Co-authored-by: Barry Deeney <6980177274bf416ddda559d2e52a57ba842e7edf@codedmaster.com>
Co-authored-by: Russell Yanofsky <d1818e90f775d1fa111cabb0c1a59ce802530221@yanofsky.org>

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