Fix FlowExperssionId bug

fei.rb

require 'ruote/fei'
class Ruote::FlowExpressionId
  def initialize(h)

    @h = h
    class << h; include Ruote::HashDot; end

    # Howcast: don't use sub_wfid if we arleady have a subid
    @h['subid'] = @h.delete('sub_wfid') if @h['sub_wfid'] && !@h['subid']
    # TODO : for 2.1.13, remove this
  end
end