Remove UI status caching and reset

Trying to keep track of the UI status before an operation and resetting
it afterwards does not work well for us if these operations overlap.
Therefore we remove that feature for the time being.  This could
probably be solved by using counters to keep track of the number of
ongoing operations of a certain type.

src/service.rs

@@ -486,7 +486,6 @@ impl<P: Platform> ServiceResources<P> {
                 let starttime = self.platform.user_interface().uptime();
                 let timeout = core::time::Duration::from_millis(request.timeout_milliseconds as u64);
 
-                let previous_status = self.platform.user_interface().status();
                 self.platform.user_interface().set_status(ui::Status::WaitingForUserPresence);
                 loop {
                     self.platform.user_interface().refresh();
@@ -516,7 +515,7 @@ impl<P: Platform> ServiceResources<P> {
                         }
                     }
                 }
-                self.platform.user_interface().set_status(previous_status);
+                self.platform.user_interface().set_status(ui::Status::Idle);
 
                 let result = Ok(());
                 Ok(Reply::RequestUserConsent(reply::RequestUserConsent { result } ))
@@ -725,13 +724,11 @@ impl<P: Platform> Service<P> {
 
         for ep in eps.iter_mut() {
             if let Some(request) = ep.interchange.take_request() {
-                resources.platform.user_interface().set_status(ui::Status::Processing);
                 // #[cfg(test)] println!("service got request: {:?}", &request);
 
                 // resources.currently_serving = ep.client_id.clone();
                 let reply_result = resources.reply_to(ep.client_id.clone(), &request);
 
-                resources.platform.user_interface().set_status(ui::Status::Idle);
                 ep.interchange.respond(&reply_result).ok();
 
             }