refactor: drop redundant filteredData listener in network controls

The network search field is now always enabled and no longer reads
controller.filteredData in build, so this listener only forced needless
rebuilds of the controls row on every filter change.

Author: ishaquehassan

packages/devtools_app/lib/src/screens/network/network_screen.dart

@@ -194,8 +194,6 @@ class _NetworkProfilerControlsState extends State<_NetworkProfilerControls>
         _recording = controller.recordingNotifier.value;
       });
     });
-
-    addAutoDisposeListener(controller.filteredData);
   }
 
   @override