xmpp: fix default directory for generated certs

prosody/rootfs/etc/cont-init.d/10-config

@@ -31,6 +31,6 @@ if [[ ! -f /config/certs/$XMPP_AUTH_DOMAIN.crt ]]; then
     echo | prosodyctl --config $PROSODY_CFG cert generate $XMPP_AUTH_DOMAIN
 fi
 
-# certs vill be created in /var/lib/prosody
-mv /var/lib/prosody/*.{crt,key} /config/certs/
-rm -f /var/lib/prosody/*.cnf
+# certs will be created in /config/data
+mv /config/data/*.{crt,key} /config/certs/
+rm -f /config/data/*.cnf