Fix extraneous whitespace in QueueListener.prepare (GH-13803)

diff --git a/Lib/logging/handlers.py b/Lib/logging/handlers.py
index a913d27..34ff7a0 100644
--- a/Lib/logging/handlers.py
+++ b/Lib/logging/handlers.py
@@ -1437,7 +1437,7 @@
         t.daemon = True
         t.start()
 
-    def prepare(self , record):
+    def prepare(self, record):
         """
         Prepare a record for handling.