Noticed one more bug with Postgres

The inner join clause you replace with UPDATE ... SET ... had one more problem, where one of the join clauses was produced like this:

```
FROM source_table
                AS f
              WHERE f.id = t.id
                AND "f".f.id = 1234
```

I made a patch to change that last table reference to just f.id with no quotes and was able to use mover successfully on Postgres 8.4.