fix(#18): drop redundant per-change refreshDeviceInfo in Privacy section

Human testing found Privacy controls slow to respond. _PrivacySection._apply called refreshDeviceInfo() after every toggle/dropdown change -- a 5-frame device re-query (deviceQuery, appStart, battery, customVars, autoAddFlags) that does not even re-fetch telemetry. setTelemetryModeBase already updates the connector's local state and calls notifyListeners(), so the refresh was pure overhead. Removed it; apply is now a single setOtherParams frame, matching the auto-add section's responsiveness.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

lib/screens/settings_screen.dart

@@ -1053,7 +1053,6 @@ class _PrivacySectionState extends State<_PrivacySection> {
           _advertLocPolicy ? 1 : 0,
           _multiAcks,
         );
-        await widget.connector.refreshDeviceInfo();
       } while (_applyAgain);
     } catch (e) {
       if (!mounted) return;