log: make 32 the default origin_width.

Change-Id: I1159395251332f3b1af3b3a322e7191559105faa
diff --git a/selftest/log_test.py b/selftest/log_test.py
index 2ec8635..54a0fb6 100755
--- a/selftest/log_test.py
+++ b/selftest/log_test.py
@@ -113,7 +113,7 @@
 t.dbg("debug message, no category nor name set")
 
 print('- Testing logging of Exceptions, tracing origins')
-log.style(time_fmt=fake_time)
+log.style(time_fmt=fake_time, origin_width=0)
 
 class Thing(log.Origin):
     def __init__(self, some_path):