Remove striped table styling of Find files view

What does this MR do?

Removes unnecessary alternating row background colors in "Find file" view.

Before	After

What are the relevant issue numbers?

Closes #51162 (closed).

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides