fix(backlight): recreate FileMonitor after close#729
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FileMonitor is single-use; cancel() in close() leaves it dead, so the slider stopped updating on reopen. Null it in close() and re-create lazily in connect_monitor(). Fixes ErikReider#728
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Summary
FileMonitoris single-use: oncemonitor.cancel()runs inclose()the same instance never emitschangedagain.monitorinclose()and (re)create it lazily inconnect_monitor()so everystart()gets a live monitor.Fixes #728