[orangecontrib][shift] Get dataset from widget and not dialog

orangecontrib/darfix/widgets/shiftcorrection.py

@@ -86,6 +86,6 @@ class ShiftCorrectionWidgetOW(OWWidget):
         Function to emit the new dataset.
         """
         self.shift = self._widget.shift
-        self.Outputs.dataset.send(self._widget.getDataset())
-        self.Outputs.colormap.send(self._widget.getStackViewColormap())
+        self.Outputs.dataset.send(self._widget.mainWindow.getDataset())
+        self.Outputs.colormap.send(self._widget.mainWindow.getStackViewColormap())
         self.close()