Fix typobug in bot_update.py.

Extra comma changes type from dict to tuple :(

TBR=agable@chromium.org, estaab@chromium.org, hinoka@chromium.org, martiniss@chromium.org
BUG=643885
NOPRESUBMIT=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2325763002

recipe_modules/bot_update/resources/bot_update.py

@@ -1452,7 +1452,7 @@ def print_debug_info():
     'BUILD_DIR': BUILD_DIR,
     'ROOT_DIR': ROOT_DIR,
     'DEPOT_TOOLS_DIR': DEPOT_TOOLS_DIR,
-  },
+  }
   for k, v in sorted(debug_params.iteritems()):
     print "%s: %r" % (k, v)