main/openrc: fix priority of modules-load configuration.

The previous configuration loaded in this order:

1. /etc/modules
2. /etc/modules-load.d/*.conf
3. /run/modules-load.d/*.conf
4. /usr/lib/modules-load.d/*.conf
5. /lib/modules-load.d/*.conf

This is completely backwards and with this commit it will now be.

1. /lib/modules-load.d/*.conf -> System and base packages configuration
2. /usr/lib/modules-load.d/*.conf -> Other packages configuration
3. /etc/modules -> Local admin configuration
4. /etc/modules-load.d/*.conf -> Local admin configuration (preferred)
5. /run/modules-load.d/*.conf -> Runtime configuration