Unxfail test_that_current_version_selected_in_top_crashers_header because Bug 1013916 is no longer reproduced.

The bug will remain open since the root cause of the issue has not been fixed.
Merge pull request #266 from chirarobert/unxfail_top_crashes

Unxfail test_that_current_version_selected_in_top_crashers_header becaus...