A patch from Pierre Smits for "ConvertUom.js contains a bug" https://issues.apache.org/jira/browse/OFBIZ-5661

Due to a missing comma, this function doesn't work properly.

git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1604357 13f79535-47bb-0310-9956-ffa450edef68