Fix fetching user by username

* the "profile" is actually a user object already...
* seems like a leftover from older versions user models

invenio_config_tuw/utils.py

@@ -20,12 +20,7 @@ from invenio_accounts.models import User
 
 def get_user_by_username(username):
     """Get the user identified by the username."""
-    profile = User.query.filter(User.username == username).one_or_none()
-
-    if profile is not None:
-        return profile.user
-
-    return None
+    return User.query.filter(User.username == username).one_or_none()
 
 
 def get_user(identifier):