Add Q_OBJECT macros and fix Cannot invoke tr

src/recurring.h

@@ -121,6 +121,8 @@ private:
 // Model for list of configured recurring payments
 class RecurringListViewModel : public QAbstractTableModel {
 
+	Q_OBJECT
+
 public:
     RecurringListViewModel(QTableView* parent);
     ~RecurringListViewModel() = default;
@@ -138,6 +140,8 @@ private:
 // Model for history of payments
 class RecurringPaymentsListViewModel : public QAbstractTableModel {
 
+	Q_OBJECT
+
 public:
     RecurringPaymentsListViewModel(QTableView* parent, RecurringPaymentInfo rpi);
     ~RecurringPaymentsListViewModel() = default;