test(modal): remove redundant header swipe test

[liamdebeasi]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

The purpose of the card-scroll-target tests is to verify that swiping on the custom content scroll target works as intended. Swiping on the header is not needed as the regular card tests already check for this.

What is the new behavior?

• Removed the redundant swiping on the header test for the custom scroll target

Does this introduce a breaking change?

• Yes
• No

Other information