Replace `db.traits` with `db.sample_data`
Replace `db.traits` with `db.sample_data`

* wqflask/wqflask/metadata_edits.py: Replace imports that start with
`db.traits` with `db.sample_data`.

genenetwork/genenetwork2,genenetwork/genenetwork2,genenetwork/genenetwork2,genenetwork/genenetwork2