ensure metronome owns domain dir

When adding new domains to Yunohost a directory for each newly added domain is created in `/var/lib/metronome` unfortunately since the directory is created with `sudo mkdir` that means `root:root` owns the directory. Metronome will now fail to write to the directory.

data/hooks/conf_regen/12-metronome

@@ -51,6 +51,7 @@ do_post_regen() {
   # create metronome directories for domains
   for domain in $domain_list; do
     sudo mkdir -p "/var/lib/metronome/${domain//./%2e}/pep"
+    sudo chown -R metronome: /var/lib/metronome/${domain//./%2e}/
   done
 
   [[ -z "$regen_conf_files" ]] \