Reset timer by long pressing on the button (#1214)

* Reset timer by long pressing on the button

* Consider press_lost as released

Otherwise the bar would keep increasing if the finger slid off the
button

src/displayapp/DisplayApp.cpp

@@ -183,7 +183,7 @@ void DisplayApp::Refresh() {
       case Messages::TimerDone:
         if (currentApp == Apps::Timer) {
           auto* timer = static_cast<Screens::Timer*>(currentScreen.get());
-          timer->SetDone();
+          timer->Reset();
         } else {
           LoadApp(Apps::Timer, DisplayApp::FullRefreshDirections::Down);
         }