Fix : Show 'Exit group' menu entry also for non group nodes.

The Exit Group menu entry was mistakenly only whown for nodes who are
themselves also group nodes. It should be show for any node inside a
group.

Pull Request: https://projects.blender.org/blender/blender/pulls/106643

scripts/startup/bl_ui/space_node.py

@@ -555,8 +555,8 @@ class NODE_MT_context_menu(Menu):
             layout.operator("node.group_edit", text="Edit").exit = False
             layout.operator("node.group_ungroup", text="Ungroup")
 
-            if is_nested:
-                layout.operator("node.tree_path_parent", text="Exit Group", icon='FILE_PARENT')
+        if is_nested:
+            layout.operator("node.tree_path_parent", text="Exit Group", icon='FILE_PARENT')
 
         layout.separator()