Updates to ID funding schema

Some changes to the schema (different titles, sectors in alphabetical order, new sectors) requested by DFID ahead of going live next week.
Why not:

```ruby
fields = fund.extra_fields
fields["fund_state"] = fields.delete("application_state")
fields["value_of_funding"] = fields.delete("value_of_fund")
fund.update_attribute(:extra_fields, fields)
```

It's just a hash, right?

To be fair, it's just a migration, so I'm not going to "not merge" based on code style as it'll run once.