logtoprocess: do not leak the ui object in uisetup

logtoprocess.log should use "self" passed in function arguments instead
of the "ui" object from outside the function.

hgext/logtoprocess.py

@@ -92,7 +92,7 b' def uisetup(ui):'
             Arguments are passed on as environment variables.
 
             """
-            script = ui.config('logtoprocess', event)
+            script = self.config('logtoprocess', event)
             if script:
                 if msg:
                     # try to format the log message given the remaining