Appease Rubocop once more

Author: techlingyi

app/models/work.rb

@@ -379,18 +379,18 @@ def destroy_chapters_in_reverse
 
   after_destroy :clean_up_assignments
   def clean_up_assignments
-    self.challenge_assignments.each { |a|
+    self.challenge_assignments.each do |a|
       a.creation = nil
       a.save!
-    }
+    end
   end
 
   after_destroy :clean_up_claims
   def clean_up_claims
-    self.challenge_claims.each { |a|
+    self.challenge_claims.each do |a|
       a.creation = nil
       a.save!
-    }
+    end
   end
 
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