Update does not work when setting generated column to default

The following query works in Postgres but errors out in Doltgres
```
postgres=# create table t1 (i int primary key, j int generated always as (i + 10) stored);
CREATE TABLE

postgres=# insert into t1 (i, j) values (1, default);
INSERT 0 1
postgres=# select * from t1;
i | j
---+----
1 | 11
(1 row)

postgres=# update t1 set j = default where i = 1;
UPDATE 1
```

Doltgres error: `ERROR: UPDATE: non-Doltgres type found in source: () (SQLSTATE XX000)`

Test case skipped and tagged with issue link in https://github.com/dolthub/go-mysql-server/pull/3705

Start by reproducing the PostgreSQL query in Doltgres, then inspect the skipped test case and issue link in go-mysql-server PR 3705. Done means updating a generated column with DEFAULT succeeds and the regression test is enabled and passes.

Written by the indexing model from the issue text.