Fix typo which disabled async jsunit running. https://codereview.appspot.com/9149043
Fix typo which disabled async jsunit running.
https://codereview.appspot.com/9149043

r5381 introduced the jsunit.beSynchronous flag for the benefit of
RhinoTestBed, but computed it incorrectly so that it was always true.

R=felix8a@gmail.com



git-svn-id: eb21526166532bd3afc2c1499c0cf105ce815f5a@5398 360991c0-9f3b-0410-ba87-8b362a00edf4

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