Add back the QR code download button

[lakchote]

QR code download doesn't work anymore (as of today) since the new arch (Fabric PR) got merged.

TL;DR: react-native-view-shot does not support new arch yet.

It was decided here to hide the Download button for QR code in the meantime, to prevent users from encountering bugs and degrading user experience.

When the update 0.74 for react-native is available, we should:

• use it so react-native-view-shot works again as intended
• Revert PR here and show back the Download button.

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