fix: remove unneeded code

Author: rubenfonseca

aws_lambda_powertools/event_handler/openapi/params.py

@@ -195,7 +195,6 @@ def __init__(
         **extra: Any,
     ):
         assert default is ..., "Path parameters cannot have a default value"
-        self.in_ = self.in_
         super(Path, self).__init__(
             default=default,
             default_factory=default_factory,