[fix] fix exception when refresh tx history

src/sakia/gui/navigation/txhistory/controller.py

@@ -213,4 +213,4 @@ class TxHistoryController(QObject):
         self._logger.debug("Found {} new dividends".format(len(new_dividends)))
 
         for ud in new_dividends:
-            self.app.new_dividend.emit(self.model.connection, ud)
+            self.model.app.new_dividend.emit(self.model.connection, ud)