Fix #3810 X/Y Property Update on Locked View

- fixes x/y update when position locked for simple
  Views and ProjectionGroups.

src/Mod/TechDraw/App/DrawView.h

@@ -87,9 +87,11 @@ public:
     virtual double getScale(void) const;
     void checkScale(void);
     void requestPaint(void);
+    virtual void handleXYLock(void);
+    virtual bool isLocked(void) const;
 
 protected:
-    void onChanged(const App::Property* prop) override;
+    virtual void onChanged(const App::Property* prop) override;
     std::string pageFeatName;
     bool autoPos;
     bool mouseMove;