Remove timestamp from follow requests because it is the timestamp of account creation

lib/controls/notifications_control.dart

@@ -142,7 +142,9 @@ class NotificationControl extends StatelessWidget {
           onTapUrl: (_) async => onTap!(),
         ),
       ),
-      subtitle: GestureDetector(
+      subtitle: notification.type == NotificationType.follow_request
+          ? null
+          : GestureDetector(
               onTap: onTap,
               child: Text(
                 ElapsedDateUtils.epochSecondsToString(notification.timestamp),