Increase window size during e2e tests

What does this MR do?

Recently some change on master made the profile dropdown not visible in an iPad viewport, and also in the viewport used by the end-to-end tests.

This MR makes the window size bigger during the tests, so they are not affected by this issue.

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content