bugfix/KAD-3677

[gilbert-hernandez]

🎫 #[Jira Ticket]
https://stellarwp.atlassian.net/browse/KAD-3677
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Checklist

• I have performed a self-review.
• No unrelated files are modified.
• No debugging statements exist (Ex: console.log, error_log).
• There are no warnings or notices in the wordpress error log.
• Passes all tests (linting, acceptance, & unit)

Block specific checklist (where relevant)

• Tested with an existing instance of this block .
• Tested creating a new instance of this block.
• Tested with Dynamic content & Elements.

[gilbert-hernandez]

The initial issue was that the slider/carousel galleries weren't showing the shadow the same as the other gallery types. However, there is a note that the sliders and carousels will cutoff shadows due to the way they are hidden. But, I noticed that the thumbnails in the thumbnail sliders weren't showing the shadow on the frontend. This fix is to show the shadows on thumbnails in the slider.