Remove useless iframe config option

app/controllers/dashboard_controller.rb

@@ -65,6 +65,8 @@ class DashboardController < ApplicationController
         response.headers["Cache-Control"] = "no-cache, no-store"
         response.headers["Pragma"] = "no-cache"
         response.headers["Expires"] = "0"
+        response.headers["X-Frame-Options"] =
+          "ALLOWALL" if [:main_app, :demo].include?(actn)
         load_css_assets
         load_js_assets
         render actn

config/application.rb

@@ -16,9 +16,6 @@ module FarmBot
     config.middleware.use Rack::Attack
     config.active_record.schema_format = :sql
     config.active_job.queue_adapter = :delayed_job
-    config.action_dispatch.default_headers = {
-      "X-Frame-Options" => "ALLOW-FROM https://farm.bot",
-    }
     config.action_dispatch.perform_deep_munge = false
     I18n.enforce_available_locales = false
     LOCAL_API_HOST = ENV.fetch("API_HOST", "parcel")