Committed Changes for DNN-5909 - GetFoldersByPermission Performance Improvement

Changes to the GetFoldersbyPermission procedure to improve performance.  Change was removing "Users" and "UserRoles" from the last query in the procedure.  These tables are un-used, not returned, and not filtering any data.  Removing these reduce the CPU cost greatly.  Full details on DNN JIRA ticket 5909!
@BrandonHaynes @bdukes I think that Brandon's recommendation is the "safest", but I'm trying to find a situation where there is a difference.  I've tested on 15+ sites now and I cannot get this updated query to have different results. If the scenario is mentioned by @bdukes then I do believe this fixes a bug that I've heard about for years as well.