Fix missing refactors related to cftw

Commit 4fa1b3e8 missed to update other calls to cftw that were still
relying on the older interface, causing unexpected errors.

As a side effect, user quotas are now calculated asynchronously i.e.,
without blocking other clients.

While the same improvement was planned for the /rm endpoint, it proved
too challenging to implement for a first refactor: on one hand, /rm
takes one or more key-value pairs involving the top-level directories
and/or files to remove. On the other hand, every directory must be
traversed recursively as rmdir(2) must be used on empty directories.

While certainly possible, it was considered to keep a synchronous
behaviour for do_rm for the sake of simplicity.

1 files changed, 0 insertions, 0 deletions

diff --git a/libweb b/libweb
-Subproject 5a6f30440b66fe6713acb9d979dc3e6624e4c36
+Subproject 4918cf87d3cf5d3dd8425fe10d97a06282472df