Bug: Unable to select P2TR watch-only keys

[sutterseba]

To create a watch-only wallet, you would normally select an airgapped key to create a new wallet. This works fine for e.g. native segwit, however, if Taproot is selected as the address type, no keys are available in the next step, even if an airgapped key with path m/86' in its descriptor is available.

This would be a great fix, as there are very few Taproot enabled watch-only wallets available right now. Tested and reproduced this on iOS and assuming it also applies to the Android version.