delete session cookie when logging out and deleting account

apps/users.lua

@@ -126,8 +126,10 @@ app:post("user_delete", "/:username/delete", function(self)
     return {redirect_to = self:url_for("user_delete_confirm", {username = me.username})}
   end
   
+  local session = Sessions:find({key = self.session.session_key})
+  session:delete()
+  self.session.queue_delete = true
   util.transfer_and_delete_user(target_user)
-  util.inject_infobox(self, "Your account has been added to the deletion queue.")
   return {redirect_to = self:url_for("user_signup")}
 end)
 
@@ -379,7 +381,7 @@ app:post("user_logout", "/logout", function (self)
 
   local session = Sessions:find({key = self.session.session_key})
   session:delete()
-  self.session = nil
+  self.session.queue_delete = true
   return {redirect_to = self:url_for("user_login")}
 end)