ValuesQuery execution fails when using select_related()

Describe the bug
When trying to join multiple tables and select only specific fields then the ValuesQuery fails.

To Reproduce
Version:

    from tortoise import __version__
    print(f"Tortoise ORM version: {__version__}")

Tortoise ORM version: 0.20.0

The models:

class A(Model):
    id = fields.IntField(pk=True)
    name = fields.CharField(max_length=10)
    rel = fields.ReverseRelation["models.B"]

class B(Model):
    a = fields.OneToOneField('models.A', related_name='rel')
    id = fields.IntField(pk=True)
    score = fields.IntField()

Create test data:

a = await A.create(name="test")
b = await B.create(score=1, a=a)

The query:

query = A.all().select_related("B").values('name', 'rel__score')

query.sql() generates the proper SQL query:

    raw_sql = query.sql()
    print(raw_sql)

SELECT "a"."name" "name","b"."score" "rel__score" FROM "a" LEFT OUTER JOIN "b" ON "a"."id"="b"."a_id"

Executing the raw SQL works:

    conn = Tortoise.get_connection("default")
    result = await conn.execute_query(raw_sql)
    print(result)

(1, [<Record name='test' rel__score=1>])

Using _execute() works as well:

    result = await query._execute()
    print(result)

[{'name': 'test', 'rel__score': 1}]

Executing the query fails:

    result = await query
    print(result)

asyncpg.exceptions.UndefinedColumnError: column "score" does not exist

Expected behavior
await query should not fail as the query is correct.

Additional context
I played a bit with the ValuesQuery class in queryset.py and added some prints to see where things go wrong.

Added some prints the __await__ :

    def __await__(self) -> Generator[Any, None, Union[List[Dict[str, Any]], Dict[str, Any]]]:
        if self._db is None:
            self._db = self._choose_db()  # type: ignore

        print("==============================")
        print(self.query)
        
        self._make_query()

        print(self.query)
        print("==============================")

        return self._execute().__await__()  # pylint: disable=E1101

The result is:

==============================
SELECT "a"."name" "name","b"."score" "rel__score" FROM "a" LEFT OUTER JOIN "b" ON "a"."id"="b"."a_id"
SELECT "name" "name","score" "rel__score" FROM "a"
==============================

From the looks of it self._make_query() leaves out the table joins for some reason in ValuesQuery.

Start in queryset.py with ValuesQuery.await and _make_query(), then run the reproduction against the PostgreSQL backend. Compare the query before and after _make_query(); done means awaiting the ValuesQuery preserves the joins and returns the same values as _execute() and the raw SQL.