CRM-14353 fix for changed fields check not being disabled on submit

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* CRM-14353: Fix formNavigate to work with multiple forms & ajax
  https://issues.civicrm.org/jira/browse/CRM-14353
Merge pull request #3129 from ginkgomzd/CRM-14353-fixes

CRM-14353 fix for changed fields check not being disabled on submit