Close test_scroll_into_view session before running the next test.
Unless closing the session, the software keyboard keeps opening, thus the next
test case will not work as expected.
Differential Revision: https://phabricator.services.mozilla.com/D217057
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1908828
gecko-commit: 37808d03b86d1c20ea8dabcc4c9feccbfcbf5cf3
gecko-reviewers: whimboo, webdriver-reviewers