[Issue 6292] [apply-config-from-env.py] Fix the script when settings are already present

[andresgaragiola]

Fixes #6292

Motivation

As is detailed in the issue, the script is not working properly when the settings are already present in the configuration file.

Modifications

I added an else branch in an existent if that changes the elements of the lines array with existent settings.

Verifying this change

• [X ] Make sure that the change passes the CI checks.

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API: no
• The schema: no
• The default values of configurations: no
• The wire protocol: no
• The rest endpoints: no
• The admin cli options: no
• Anything that affects deployment: yes

Documentation

• Does this pull request introduce a new feature? no