Fix Layout/SpaceInsideParens in fixtures

What does this MR do and why?

This MR fixes the Layout/SpaceInsideParens offenses in in fixtures

Screenshots or screen recordings

N/A

How to set up and validate locally

1. Run the following command

bundle exec rubocop --autocorrect --only Layout/SpaceInsideParens spec/frontend

There should be zero offenses

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #239356