component/proftpd: update source repository for proftpd/mod_auth_web

This repository from the source of the pull request was removed, let's use a
local copy for now.

component/proftpd/buildout.cfg

@@ -48,8 +48,8 @@ patches =
 recipe = slapos.recipe.build:gitclone
 #repository = https://github.com/proftpd/mod_auth_web
 # XXX until https://github.com/proftpd/mod_auth_web/pull/1 gets merged, we use
-# the source repository of this PR directly
-repository = https://github.com/jwm/mod_auth_web
+# a copy of this repository on nexedi gitlab
+repository = https://lab.nexedi.com/jerome/mod_auth_web
 revision = dec090bd0e287544a34be156ee17f715bd4286f9
 git-executable = ${git:location}/bin/git