Applied bug fix from jira issue - OFBIZ-5773 - <@htmlTemplate.renderDateTimeField> icon buttons disappear on some pages after refresh. 
Thanks Akash Jain for the contribution. 

git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1626419 13f79535-47bb-0310-9956-ffa450edef68