Improve display layout editor for zooming into corners, also limit the scale to 10 to match slider.

UI/DisplayLayoutScreen.h

@@ -44,6 +44,7 @@ private:
 	UI::PopupMultiChoice *zoom_;
 	UI::PopupMultiChoice *rotation_;
 	bool displayRotEnable_;
+	bool bRotated;
 	// Touch down state for drag to resize etc
 	float startX_;
 	float startY_;