update firefox download_complete needle screenshot

seems like the overlay of the little 'speech bubble' triangle
changed a bit, with a recent GTK+ or something I guess. Since
this test is quite new we shouldn't need to keep the old
version, so just replace the screenshot.
This commit is contained in:
Adam Williamson 2016-08-09 10:48:44 -07:00
parent 6fdc9934d4
commit e57c7c9805

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