[AlexAndBear]

Description

Some sidebar panel actions (the buttons that open a sub-panel in the right sidebar) still used the filled icon variant, while the others (sharing, versions, space members, activities) already used the line variant. This PR switches the remaining ones to iconFillType: 'line' for consistency:

• Files: "Image Info" and "Audio Info"
• Admin settings / Groups: "Edit group" and "Members"
• Admin settings / Users: "Edit user"

Related Issue

• Fixes <issue_link>

How Has This Been Tested?

• test environment: local dev setup, unit tests
• test case 1: pnpm test:unit --run for the admin-settings views and files sidebar extensions
• test case 2: lint on the changed files

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)