Fix linting errors

Fix RuboCop offenses found when running version 1.86.0.

Author: lfdebrux

app/models/step.rb

@@ -54,7 +54,7 @@ def assign_question_attributes(params)
   end
 
   def params
-    question.attribute_names.concat([selection: []])
+    question.attribute_names.concat([{ selection: [] }])
   end
 
   delegate :valid?, to: :question