Minor fixed in test_capture

This test failed only in py34. We don't import logging directly,
but it seems that one of the standard modules that are now
globally imported started including this on py34.

Just removed the assert as it doesn't seem central to the
test's objective.

testing/test_capture.py

@@ -340,8 +340,6 @@ class TestLoggingInteraction:
         p = testdir.makepyfile("""
             import sys
             def test_something():
-                # pytest does not import logging
-                assert 'logging' not in sys.modules
                 import logging
                 logging.basicConfig()
                 logging.warn("hello432")