Specify correct category for SetLayerTreeId event

Summary:
# Changelog: [Internal]

In Chrome, this event has `disabled-by-default-devtools.timeline` category. This also implies that this event won't be displayed on a timeline by default, which is what we want.

Differential Revision: D88274243

Author: hoxyq

packages/react-native/ReactCommon/jsinspector-modern/tracing/TraceEventGenerator.cpp

@@ -22,7 +22,7 @@ namespace facebook::react::jsinspector_modern::tracing {
 
   return TraceEvent{
       .name = "SetLayerTreeId",
-      .cat = {Category::Timeline},
+      .cat = {Category::HiddenTimeline},
       .ph = 'I',
       .ts = timestamp,
       .pid = processId,