Fix DemoFamilyRefreshJob demo email config lookup (#1426)

* Fix demo refresh email config lookup

Use indifferent access when reading demo config so the refresh job works whether config keys are strings or symbols. Add a regression test covering symbol-keyed config_for output.

* Remove unnecessary blank line in test file

Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>

---------

Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>

test/jobs/demo_family_refresh_job_test.rb

@@ -61,4 +61,14 @@ class DemoFamilyRefreshJobTest < ActiveJob::TestCase
       assert_match(/\+deleting-/, @demo_user.email)
     end
   end
+
+  test "reads demo email when config_for returns symbol keys" do
+    Rails.application.stubs(:config_for).with(:demo).returns({ email: @demo_email })
+
+    generator = mock
+    generator.expects(:generate_default_data!).with(skip_clear: true, email: @demo_email)
+    Demo::Generator.expects(:new).returns(generator)
+
+    DemoFamilyRefreshJob.perform_now
+  end
 end