Update fortios.rb

[systeembeheerder]

Pre-Request Checklist

• [?] Passes rubocop code analysis (try rubocop --auto-correct)
• [N] Tests added or adapted (try rake test)
• [N] Changes are reflected in the documentation
• [N] User-visible changes appended to CHANGELOG.md

Description

Make 'found' and 'account' optional. Fix trailing double quote to keep correct, usable, config.

See #3161