PostgreSQL credentials in development docker config don't match server config

Running `make dev` starts PostgreSQL docker container, but user, password and database name are all set to be `odk`.

Now running `make` in `server` directory fails because of wrong credentials.

```
➜  cd server
➜  make
node lib/bin/enforce-node-version.js
node lib/bin/run-migrations.js
Error: password authentication failed for user "jubilant"
make: *** [migrations] Error 1
```
