CRM-13913 - api/v3/WordReplacement - Set default (is_active=1)

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* CRM-13913: WordReplacements created via API should default to enabled
  http://issues.civicrm.org/jira/browse/CRM-13913
Merge pull request #2162 from totten/4.4-wp-active

CRM-13913 - api/v3/WordReplacement - Set default (is_active=1)