Fix gigitty link

The modal didn't really work on mobiles. On mobiles you also need the schedule
link because it's hard to point your mobile to a QR code on your mobile...

app/models/ability.rb

@@ -31,7 +31,7 @@ class Ability
       event.state == 'confirmed'
     end
 
-    can [:show, :events], Schedule do |schedule|
+    can [:show, :events, :app], Schedule do |schedule|
       schedule.program.schedule_public
     end