Fix pg db name argument

[NathanaelRea]

Two fixes:

1. Since the long argument was --database-name, the variable was passed as databaseName, but the connection was looking for database, and not saving the name in the config.
2. Root arguments use -d as --debug, which will eat any -d used for database connections. Therefore I moved both postgres and snowflake -d to -n for "database name"

edit: accidentally closed