down with alias_method_chain

Change-Id: Iac0d7b8e97f2944b4edcea62d5e84c934d3cb8fb
Reviewed-on: https://gerrit.instructure.com/62024
Tested-by: Jenkins
Reviewed-by: Rob Orton <rob@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>

Author: ccutrer

app/models/assignment_override.rb

@@ -134,14 +134,13 @@ def set_id
     read_attribute(:set_id)
   end
 
-  def set_with_adhoc
+  def set
     if self.set_type == 'ADHOC'
       assignment_override_students.includes(:user).map(&:user)
     else
-      set_without_adhoc
+      super
     end
   end
-  alias_method_chain :set, :adhoc
 
   def set_id=(id)
     if self.set_type == 'ADHOC'