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!
Couldn't these lines be simplified to :
FP.PermissionID = @Read OR
FP.PermissionID = @Write OR
FP.PermissionID = @Browse OR
FP.PermissionID = @Add

either the variable has a value or null so don't think the case is necesary here 
(same below)