tp: fix type in registry constructor

Change-Id: I67f2c8d3c9dea2ac57aec7de8b49ca22d2dff230
diff --git a/python/perfetto/trace_uri_resolver/registry.py b/python/perfetto/trace_uri_resolver/registry.py
index 9f33982..7a57bb0 100644
--- a/python/perfetto/trace_uri_resolver/registry.py
+++ b/python/perfetto/trace_uri_resolver/registry.py
@@ -32,7 +32,7 @@
     generator: TraceGenerator
     metadata: Dict[str, str]
 
-  def __init__(self, resolvers: List[TraceUriResolver] = []):
+  def __init__(self, resolvers: List[Type[TraceUriResolver]] = []):
     self.registry: Dict[str, Type[TraceUriResolver]] = dict()
 
     for resolver in resolvers: