Fix barcode/assist/settings overlays, manage all overlays with 1 reference #2769
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Summary
overlayViewController reference was mistakenly weak, which was causing barcode scanner to not be displayed. On top of that now we can always have just one overlay, assist/barcode scanner/settings, presenting one will dismiss the previous one.
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Link to pull request in Documentation repository
Documentation: home-assistant/companion.home-assistant#
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