fix regression introduced by
https://github.com/aenix-io/cozystack/pull/376
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
- **New Features**
- Enhanced flexibility in PostgreSQL configuration with conditional
handling of the `max_connections` parameter.
- **Bug Fixes**
- Improved parameter assignment logic for better configuration
management.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Introduced a new configuration parameter `max_connections` for
PostgreSQL, allowing users to specify the maximum number of concurrent
connections.
- Added a "Server Configuration" section in the settings for easier
management of PostgreSQL parameters.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Signed-off-by: Andrei Kvapil <kvapss@gmail.com>
Co-authored-by: Andrei Gumilev <andrey.gumilev@aenix.io>
Co-authored-by: Andrei Kvapil <kvapss@gmail.com>