This is needed because next commit moves `vQueueNotifications` to `TransactionTablePriv` member.
This is a backport of [[https://github.com/bitcoin-core/gui/pull/120 | core-gui#120]] [1/2]
https://github.com/bitcoin-core/gui/pull/120/commits/7b3b2303f44031c3545651858f697a495c3ea37a