Remove event.clear() call

Author: colesbury

Lib/test/test_concurrent_futures/test_wait.py

@@ -114,7 +114,6 @@ def test_all_completed(self):
 
     def test_timeout(self):
         short_timeout = 0.050
-        self.event.clear()
 
         future = self.executor.submit(self.event.wait)