Fix styles for dropdown items inside dimmed_text elements

Setup

1. Log in as administrator
2. Navigate to Reports in the user menu
3. Press New report button
4. Set any report name.
5. Set Report source to "Courses"
6. Press Save
7. Click on Audience tab
8. Add All users audience and press Save changes
9. Click on Schedules tab
10. Press New schedule
    1. Select a schedule Name
    2. Select All users: All site users audience
    3. Select a Subject and a Body
11. Press Save

Test dropdown menu inside a dimmed row

1. Click on the toggle button to disable the schedule
2. Confirm that the schedule row is dimmed
3. Confirm that the dropdown icon is displayed normally (not dimmed)
4. Click on the action menu dropdown icon for the dimmed schedule
5. Confirm that the dropdown actions are displayed normally (not dimmed)

Test applying text-muted to a dropdown-item directly

1. Using the browser inspector, add "text-muted" class to the "dropdown-item menu-action" element in the schedule row ("Delete schedule" action for example)
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2. Confirm that the "Delete schedule" dropdown item is displayed with dimmed text