Fix build

Author: NathanW2

python/gui/symbology-ng/qgsrulebasedrendererv2widget.sip

@@ -115,8 +115,7 @@ class QgsRendererRulePropsWidget: QgsPanelWidget
   public slots:
     void testFilter();
     void buildExpression();
-    void accept();
-    void apply() override;
+    void apply();
     virtual void setDockMode( bool dockMode);
 };