Update config.js

[vitaly-t]

Correcting use of the connection string:

• Specify defaults for each property separately, with the constructor
• use Virtual Properties hostname and port when using only the first host, for safer access
• Database name within connection string is always the first segment of the url path, and not a url parameter

[MasterOdin]

Thanks for this, as it definitely improves the usage here, and gets closer to phasing out the need for setting these variables at all and just relying on the defaults.

Looks like the tests are failing as it cannot find the database, which I'm guessing is blank as I think the default for database here is wrong maybe, or that just need to update https://github.com/sqlectron/sqlectron-core/blob/master/.github/workflows/test.yml to use the proper DSN form.

[vitaly-t]

Also, for most frameworks, you do not need to specify default empty password, you just skip it, so you can delete password: '' from the defaults.

[MasterOdin]

Yup, though the passwords being blank is more a current symptom of the CI and local environments using different passwords and me wanting to unify that first, and then set an actual password. Having it blank was more a reminder to me of just getting around to doing that at some point.

Thanks again though for improving this!