remove buckets folder option

the related code still works for old deployments

weed/command/scaffold/filer.toml

@@ -12,8 +12,6 @@
 # with http DELETE, by default the filer would check whether a folder is empty.
 # recursive_delete will delete all sub folders and files, similar to "rm -Rf"
 recursive_delete = false
-# directories under this folder will be automatically creating a separate bucket
-buckets_folder = "/buckets"
 
 ####################################################
 # The following are filer store options