remove useless conditional

`@reflects_state[depth+1]` will always be nil because we haven't made a
method call that would make it true yet.

activerecord/lib/active_record/core.rb

@@ -522,7 +522,7 @@ def update_attributes_from_transaction_state(transaction_state, depth)
           @reflects_state[depth] = true
         end
 
-        if transaction_state.parent && !@reflects_state[depth+1]
+        if transaction_state.parent
           update_attributes_from_transaction_state(transaction_state.parent, depth+1)
         end
       end