Fixes bitcoin-core/gui#571.
CWallet::Create() notifies about wallet loading too early, that results the notification goes before DescriptorScriptPubKeyMans were created and added to an encrypted wallet.
And interfaces::Wallet::taprootEnabled() in https://github.com/bitcoin/bitcoin/blob/ecf692b466860f44334a1da967fc2559da913bec/src/qt/receivecoinsdialog.cpp#L100-L102 erroneously returns false for just created encrypted descriptor wallets.