message: Add "Minted" and "Masternode Reward" to TX list filter
  The two mentioned transaction types already existed, but there was no
  option of selecting them as a filter in the UI dropdown.
  resolves
diff: @@ -96,6 +96,8 @@ TransactionView::TransactionView(QWidget *parent) :
  typeWidget->addItem(tr("Obfuscation Collateral Payment"), TransactionFilterProxy::TYPE(TransactionRecord::ObfuscationCollateralPayment));
  typeWidget->addItem(tr("To yourself"), TransactionFilterProxy::TYPE(TransactionRecord::SendToSelf));
  typeWidget->addItem(tr("Mined"), TransactionFilterProxy::TYPE(TransactionRecord::Generated));
  + typeWidget->addItem(tr("Minted"), TransactionFilterProxy::TYPE(TransactionRecord::StakeMint));
  + typeWidget->addItem(tr("Masternode Reward"), TransactionFilterProxy::TYPE(TransactionRecord::MNReward));
  typeWidget->addItem(tr("Other"), TransactionFilterProxy::TYPE(TransactionRecord::Other));
  typeWidget->setCurrentIndex(settings.value("transactionType").toInt());
  