revert unrelated change

Author: BYK

src/h2/events.py

@@ -589,9 +589,11 @@ def __init__(self):
         self.field_value = None
 
     def __repr__(self):
-        return "<AlternativeServiceAvailable origin:%s, field_value:%s>" % (
-            self.origin.decode("utf-8", "replace"),
-            self.field_value.decode("utf-8", "replace"),
+        return (
+            "<AlternativeServiceAvailable origin:%s, field_value:%s>" % (
+                self.origin.decode('utf-8', 'ignore'),
+                self.field_value.decode('utf-8', 'ignore'),
+            )
         )