test/py: Drop assigning ubman to cons

Now that we have a shorter name, we don't need this sort of thing. Just
use ubman instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/py/tests/test_event_dump.py b/test/py/tests/test_event_dump.py
index 8297663..b9d48f5 100644
--- a/test/py/tests/test_event_dump.py
+++ b/test/py/tests/test_event_dump.py
@@ -11,9 +11,8 @@
 @pytest.mark.boardspec('sandbox')
 def test_event_dump(ubman):
     """Test that the "help" command can be executed."""
-    cons = ubman
-    sandbox = cons.config.build_dir + '/u-boot'
-    out = utils.run_and_log(cons, ['scripts/event_dump.py', sandbox])
+    sandbox = ubman.config.build_dir + '/u-boot'
+    out = utils.run_and_log(ubman, ['scripts/event_dump.py', sandbox])
     expect = '''.*Event type            Id                              Source location
 --------------------  ------------------------------  ------------------------------
 EVT_FT_FIXUP          bootmeth_vbe_ft_fixup           .*boot/vbe_request.c:.*