Do not show black left border when comments are not toggleable

[nicolasfranck]

Please complete the following fields as applicable:

What version of the DMPRoadmap code are you running? (e.g. v2.2.0)

3.1.1.

Expected behaviour:

When configuration option config.x.application.guidance_comments_toggleable is set to false that black left border of 5px on the div with classguidance-section should not be there, as it is serving no purpose.

https://github.com/DMPRoadmap/roadmap/blob/development/app/views/phases/_edit_plan_answers.html.erb#L100