fix(render): remove render contentBox adjust to fix init bug in kityminder-editor

src/core/render.js

@@ -152,9 +152,6 @@ define(function(require, exports, module) {
                             renderer.getRenderShape().setVisible(false);
                             lastBoxes[j] = null;
                         }
-                        
-                        // 更新 render 的 contentBox
-                        renderer.contentBox = lastBoxes[j];
                     }
                 }