Port list reordering fix to update_child_positions too so that nested…

… items are ordered correctly too.

core/lib/refinery/crud.rb

@@ -297,7 +297,7 @@ def update_positions
 
             def update_child_positions(_node, #{singular_name})
               list = _node['children']['0']
-              list.sort.map { |item| item[1] }.each_with_index do |child, index|
+              list.sort_by {|k, v| k.to_i}.map { |item| item[1] }.each_with_index do |child, index|
                 child_id = child['id'].split(/#{singular_name}\_?/).reject(&:empty?).first
                 child_#{singular_name} = #{class_name}.where(:id => child_id).first
                 child_#{singular_name}.move_to_child_of(#{singular_name})