Migrate activityLogController.show

[ppazos]

New code:

def show(Long id)
   {
      def activityLogInstance = ActivityLog.get(id)

      // admins can access all logs
      // filter by current org! because it is accessed by id
      if (!SpringSecurityUtils.ifAllGranted("ROLE_ADMIN") &&
          (!activityLogInstance || activityLogInstance.organizationUid != session.organization.uid))
      {
         flash.message = message(code:'activityLog.show.cantAccessLog')
         redirect action:'index'
         return
      }
      return [activityLogInstance: activityLogInstance]
   }

[ppazos]

this was already done