Fix #105316: Error import dxf in scene collection

Exclude the case of scene collection when importing to selected collection.

Pull Request: https://projects.blender.org/blender/blender-addons/pulls/105317

Author: RobLop

io_import_dxf/__init__.py

@@ -570,7 +570,7 @@ def execute(self, context):
                     collection = scene.collection
                 case _:
                     collection = bpy.context.collection
-                    if collection.name not in scene.collection.children: scene.collection.children.link(collection)
+                    if collection != scene.collection and collection.name not in scene.collection.children: scene.collection.children.link(collection)
 
             if RELEASE_TEST:
                 # for release testing