[GUI] OGR Database connection dialog: relax checks to enable 'OK' button
Currently when defining a new OGR Database connection, one must fill the database, host and port numbers. Some/most of them are optional on the OGR side (for example the MYSQL driver only requires the database name, but the PG driver could for example work without any depending on the PG config), so do not require them at all. The 'Test connection' button is already there for users to check they've properly filled the form.
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