fix(engine): fix the creation of a restricted user (#418)

Author: agneum

engine/internal/provision/databases/postgres/postgres_mgmt.go

@@ -143,7 +143,7 @@ begin
   for r in select datname from pg_catalog.pg_database where not datistemplate loop
     raise debug 'Changing owner of %', r.datname;
     execute format(
-      'alter database %s owner to %s;',
+      'alter database %s owner to "%s";',
       r.datname,
       new_owner
     );