merge_pr_49808

[wdspec] Fix WebDriver classic and BiDi drag and drop position tests.

Differential Revision: https://phabricator.services.mozilla.com/D232725

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1871346
gecko-commit: d13caad2c6161773f359021d3ebe132880d93bf6
gecko-reviewers: webdriver-reviewers, Sasha