fixes #5030 - reload filter on package group/errata rule list

Since we are using the rule list on the filter object to determine which filter rule id to 
remove, we need to fetch the new list on each page load
It does and it doesn't. This controller fetches the errata associated to the filter and lists them in a nutupane table. When the user clicks remove, the selected errata IDs are matched up to the rules stored on the filter to create a resource that can then be deleted directly via the API. I think the proper fix would be to re-fresh the filter object from the API after the rules have been removed or to remove the removed rules from the filter object client side.