apps: pager: notifications: dismiss confirmation view on app exit

Currently the confirmation view remains active when we switch away from
the notification view. Ensure we dismiss when we background the
application.

Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>

wasp/apps/pager.py

@@ -94,6 +94,10 @@ class NotificationApp(PagerApp):
         wasp.system.request_event(wasp.EventMask.TOUCH)
         super().foreground()
 
+    def background(self):
+        self.confirmation_view.active = False
+        super().background()
+
     def swipe(self, event):
         if event[0] == wasp.EventType.DOWN:
             self.confirmation_view.active = True