This RPC has no helpful use while being both dangerous and a maintenance
burden.
Despite what the name says, it allows the deletion of arbitrary
transactions, and `importprunedfunds` does not allow the importing of
transactions not belonging to the user, and `listtransactions` does not
list transactions not belonging to the wallet, so this RPC can only be
used to delete transactions actually belonging to the wallet, and in the
unlikely event that transactions not belonging to the wallet are
present, they cause no harm except for occupying a few bytes on the
users disk.
