test: Avoid logging error when logging error

Github-Pull: bitcoin#31408
Rebased-From: cccca8a (minimised)

Author: MarcoFalke

test/functional/test_framework/p2p.py

@@ -361,7 +361,7 @@ def _on_data(self):
                 self.on_message(t)
         except Exception as e:
             if not self.reconnect:
-                logger.exception('Error reading message:', repr(e))
+                logger.exception(f"Error reading message: {repr(e)}")
             raise
 
     def on_message(self, message):