Fix get_ewma_or_default function   During the migration of using ets fetch by record key there was a mistake   resulting in minuteman_ewma never succeeding to fetch data from ets
Fix get_ewma_or_default function
  During the migration of using ets fetch by record key there was a mistake
  resulting in minuteman_ewma never succeeding to fetch data from ets

GoelDeepak/minuteman,GoelDeepak/minuteman