Refactor UI code for better readability and consistency

- Improved formatting of ListTile icons and text styles in settings_screen.dart, telemetry_screen.dart, usb_screen.dart, gif_picker.dart, path_editor_sheet.dart, repeater_login_dialog.dart, and room_login_dialog.dart for better readability.
- Consolidated TextStyle definitions into single lines where applicable.
- Updated notification_service.dart to enhance readability of notification ID assignment.
- Simplified function signatures in routing_sheet.dart for clarity.
- Cleaned up test assertions in usb_flow_test.dart for conciseness.
- Removed unused translations in untranslated.json to streamline localization files.

lib/screens/discovery_screen.dart

@@ -189,8 +189,7 @@ class _DiscoveryScreenState extends State<DiscoveryScreen> {
                             ),
                             action: SnackBarAction(
                               label: context.l10n.common_undo,
-                              onPressed: () =>
-                                  connector.removeContact(contact),
+                              onPressed: () => connector.removeContact(contact),
                             ),
                           );
                         },
@@ -444,7 +443,6 @@ class _DiscoveryScreenState extends State<DiscoveryScreen> {
     }
   }
 
-
   String _formatLastSeen(BuildContext context, DateTime lastSeen) {
     final now = DateTime.now();
     final diff = now.difference(lastSeen);