- Fixed reset of attributes when moving a task to a project

Steps to reproduce the bug:

1. Create a task with a couple of labels and attributes
2. Annotate several frames in the task. Attributes should have
non-default value.
3. Create a project and copy the definition of labels with attributes
4. Move the task to the project.
5. Attributes should have default values after the action
Co-authored-by: Nkirill-sizov <sizow.k.d@gmail.com>