Fix dragging objects from Outliner to 3D View broken

A dragged & dropped wouldn't be duplicated anymore, it would just be moved to
the drop position.

Caused by c8fcea0c33.

source/blender/editors/space_view3d/space_view3d.c

@@ -630,7 +630,9 @@ static void view3d_ob_drop_copy(wmDrag *drag, wmDropBox *drop)
   ID *id = WM_drag_get_local_ID_or_import_from_asset(drag, ID_OB);
 
   RNA_string_set(drop->ptr, "name", id->name + 2);
-  RNA_boolean_set(drop->ptr, "duplicate", false);
+  /* Don't duplicate ID's which were just imported. Only do that for existing, local IDs. */
+  const bool is_imported_id = drag->type == WM_DRAG_ASSET;
+  RNA_boolean_set(drop->ptr, "duplicate", !is_imported_id);
 }
 
 static void view3d_collection_drop_copy(wmDrag *drag, wmDropBox *drop)