Hide ineffective TextureProgressBar properties in the editor

Radial fill properties only have an effect when using a radial fill mode.
Stretch margin properties only have an effet when Nine Patch Stretch
is enabled.

scene/gui/texture_progress_bar.h

@@ -43,6 +43,7 @@ class TextureProgressBar : public Range {
 protected:
 	static void _bind_methods();
 	void _notification(int p_what);
+	void _validate_property(PropertyInfo &p_property) const;
 
 public:
 	enum FillMode {