Fix layer manager drag and drop (#6283)

* Fix layer manager drag and drop area

* Adjust the ratio of droppable area

packages/core/src/utils/sorter/LayersComponentNode.ts

@@ -1,6 +1,11 @@
 import { BaseComponentNode } from './BaseComponentNode';
 
 export default class LayersComponentNode extends BaseComponentNode {
+  protected _dropAreaConfig = {
+    ratio: 0.4,
+    minUndroppableDimension: 3, // In px
+    maxUndroppableDimension: 20, // In px
+  };
   /**
    * Get the associated view of this component.
    * @returns The view associated with the component, or undefined if none.