fix: table sort component having white background

[AdityaHegde]

Table sort component had a rogue white background. This doesnt work well with dark theme.

We should do something like this ASAP to avoid this: #8709

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!