moving timelines and default interact poorly

[dpsutton]

Create a timeline it is marked as default:

rc2=# select * from timeline;
 id |         name         | description | icon | collection_id | archived | creator_id |          created_at           |          updated_at           | default
----+----------------------+-------------+------+---------------+----------+------------+-------------------------------+-------------------------------+---------
  1 | Our analytics events | [null]      | star |        [null] | f        |          1 | 2022-04-28 12:11:54.741854-05 | 2022-04-28 12:11:54.741854-05 | t
(1 row)

Create a new collection and a timeline in that collection they are both default:

rc2=# select * from timeline;
 id |         name          | description | icon | collection_id | archived | creator_id |          created_at           |          updated_at           | default
----+-----------------------+-------------+------+---------------+----------+------------+-------------------------------+-------------------------------+---------
  1 | Our analytics events  | [null]      | star |        [null] | f        |          1 | 2022-04-28 12:11:54.741854-05 | 2022-04-28 12:11:54.741854-05 | t
  2 | sub collection events | [null]      | star |             2 | f        |          1 | 2022-04-28 12:29:26.65055-05  | 2022-04-28 12:29:26.65055-05  | t
(2 rows)

Move the first timeline into the second collection, we now have two defaults in the same collection:

rc2=# select * from timeline;
 id |         name          | description | icon | collection_id | archived | creator_id |          created_at           |          updated_at           | default
----+-----------------------+-------------+------+---------------+----------+------------+-------------------------------+-------------------------------+---------
  2 | sub collection events | [null]      | star |             2 | f        |          1 | 2022-04-28 12:29:26.65055-05  | 2022-04-28 12:29:26.65055-05  | t
  1 | Our analytics events  | [null]      | star |             2 | f        |          1 | 2022-04-28 12:11:54.741854-05 | 2022-04-28 12:29:42.470648-05 | t
(2 rows)

And the UI shows two with the same name: