CRM-14384 - only display date picker if is_view neq 1

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* CRM-14384: don't display date picker in survey data entry screen for view only field
  http://issues.civicrm.org/jira/browse/CRM-14384
Merge pull request #2738 from jmcclelland/no-date-picker-on-view-only-fields

CRM-14384 - only display date picker if is_view neq 1