Fix spotlight tabbed display and drop down list

[ammopt]

1. Perform a search
2. Scroll down to the bottom of the page. Click 'Create Spotlight'.
3. Enter name, click 'Create Spotlight'
4. Click "Edit" at the top.
5. For each display types of the following:

• Horizontal
• Horizontal Carousel
• Vertical
• Single Title
• Single Title with a Next Button
• Text Only List

6. Test both display modes:

• Tabbed Display
• Drop Down List

7. Make sure you have at least 2 lists created at the bottom of the edit page.
8. Verify that:

• Switching tabs works as expected for all display types
• Switching lists using the dropdown list works as expected for all display types

Before these patches:

• 'Vertical', 'Single Title', 'Single Title with next button' and 'Text Only List' did not allow to switch from tab to tab.
• When switching from the list dropdown it wouldn't change the list, but instead add to the one currently being viewed.
• The 'active' tab on 'Tabbed display' was not styled correctly for all displays other than 'horizontal-carousel'

[Jacobomara901]

Patch looks good, seems to work as intended. As I said in the slack chat, I love the extra DRY implementations. We should definitely be making an effort to go out of our way to do this if we spot areas of improvement while we're working on nearby code