[processing] Fix extent selection widget

Author: m-kuhn

python/plugins/processing/gui/ExtentSelectionPanel.py

@@ -93,7 +93,7 @@ def selectExtent(self):
         selectOnCanvasAction.triggered.connect(self.selectOnCanvas)
         useLayerExtentAction.triggered.connect(self.useLayerExtent)
 
-        if self.canUseAutoExtent():
+        if self.alg.canUseAutoExtent():
             useMincoveringExtentAction = QAction(
                 self.tr('Use min covering extent from input layers'),
                 self.btnSelect)