Update to work with latest Editor

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Manipulators/Draggable.cs

 
         void OnMouseDown(MouseDownEvent evt)
         {
-            target.TakeCapture();
+            target.TakeMouseCapture();
             m_Active = true;
             evt.StopPropagation();
         }
         void OnMouseUp(MouseUpEvent evt)
         {
             m_Active = false;
-            target.ReleaseCapture();
+            target.ReleaseMouseCapture();
             evt.StopPropagation();
         }
     }