Fix bug v-change-web-domain-name (#2915)

* Fix bug v-change-web-domain-name

* Update bin/v-change-web-domain-name

Co-authored-by: Wojciech Smoliński <wojsmol@wp.pl>

Co-authored-by: Wojciech Smoliński <wojsmol@wp.pl>

bin/v-change-web-domain-name

@@ -112,6 +112,7 @@ fi
 
 # Delete backend
 if [ -n "$BACKEND" ]; then
+    prepare_web_backend
     delete_web_backend
 fi