Fix spec due to github/secure_headers#506

Author: Eric-Guo

spec/support/shared/with_direct_uploads.rb

@@ -65,17 +65,17 @@ def around(example)
 
     csp_config = SecureHeaders::Configuration.instance_variable_get(:@default_config).csp
 
-    connect_src = csp_config.connect_src.dup
-    form_action = csp_config.form_action.dup
+    connect_src = csp_config[:connect_src].dup
+    form_action = csp_config[:form_action].dup
 
     begin
-      csp_config.connect_src << "test-bucket.s3.amazonaws.com"
-      csp_config.form_action << "test-bucket.s3.amazonaws.com"
+      csp_config[:connect_src] << "test-bucket.s3.amazonaws.com"
+      csp_config[:form_action] << "test-bucket.s3.amazonaws.com"
 
       example.run
     ensure
-      csp_config.connect_src = connect_src
-      csp_config.form_action = form_action
+      csp_config[:connect_src] = connect_src
+      csp_config[:form_action] = form_action
     end
   end