A patch from Leon for "trivial errors corrections to fieldlookup.js" https://issues.apache.org/jira/browse/OFBIZ-5330

Correct following trivial issues:
1. in lookupDescriptionLoaded.prototype.update, not assign the form when try to get filed object by its name
2. in setSourceColor, variable "target" should be given parameter "src"

git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1526456 13f79535-47bb-0310-9956-ffa450edef68