fix(module: tree): nz-tree-drop-indicator for custom tree node templates (#7579)

Co-authored-by: Alexander Zarges <az@radiosphere.com>

Author: Alexander Zarges

components/tree/tree-node-title.component.ts

@@ -41,12 +41,12 @@ import { NzTreeNode, NzTreeNodeOptions } from 'ng-zorro-antd/core/tree';
         </span>
       </span>
       <span class="ant-tree-title" [innerHTML]="title | nzHighlight: matchedValue:'i':'font-highlight'"></span>
-      <nz-tree-drop-indicator
-        *ngIf="showIndicator"
-        [dropPosition]="dragPosition"
-        [level]="context.level"
-      ></nz-tree-drop-indicator>
     </ng-container>
+    <nz-tree-drop-indicator
+      *ngIf="showIndicator"
+      [dropPosition]="dragPosition"
+      [level]="context.level"
+    ></nz-tree-drop-indicator>
   `,
   changeDetection: ChangeDetectionStrategy.OnPush,
   preserveWhitespaces: false,