traced_probes: Run as gid nobody

Bug: 73774979
Change-Id: I3f2abd87c7691ecbd721f41f76dc1c77796dd7bf
diff --git a/perfetto.rc b/perfetto.rc
index ece8862..60dfbff 100644
--- a/perfetto.rc
+++ b/perfetto.rc
@@ -25,7 +25,7 @@
     class late_start
     disabled
     user nobody
-    group shell readproc
+    group nobody readproc
     writepid /dev/cpuset/system-background/tasks
     # Clean up procfs configuration even if traced_probes crashes
     # unexpectedly.