[FIX] Odoo 14.0-16.0: don't pass parameters from the config to the command line

[bendem]

Odoo will already use those values, passing them through the command line is not necessary. Note that if the values are not found in the config, the environment or default values are still passed, keeping the existing support for environment variables.

Fixes #334

I also fixed SC2068, not sure why DB_ARGS was quoted on one line and not the other.