Don't update NoScript button every 24 minutes

Every 24 minutes we update the NoScript button according to the messages in my terminal looking like

Torbutton INFO: Updated NoScript status for security settings

This is done by calling torbutton_update_noscript_button();. The call is triggered by

if (data.startsWith("noscript.")) {
  torbutton_update_noscript_button();
}

in our preference observer. It turns out there is a timer update happening every 24 minutes which gets saved in noscript.subscription.lastCheck. This is harmless for us as there are no subscription URLs available but nevertheless excessive.

This got first mentioned in our blog: https://blog.torproject.org/blog/tor-browser-70a1-released#comment-232575