[Gecko Bug 1443652] part 1. Fix the buggy existing load-event test for stylesheets. #10218
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The test was adding the load listener to the after the load event on
the had already fired.
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1443652
gecko-commit: ba6cef216a171782bd8abcd00a08c9ae88cbfe43
gecko-integration-branch: central
gecko-reviewers: bholley