isc_info_sql_relation_alias should not report a quoted alias

Given the following query:

```sql
SELECT a.RDB$CHARACTER_SET_NAME
FROM RDB$CHARACTER_SETS a
WHERE a.RDB$CHARACTER_SET_ID = ? OR a.RDB$BYTES_PER_CHARACTER = ?
```

Before the schema change, `isc_info_sql_relation_alias` reported `A`, now it reports `"A"`. This info item, just like the others, should not contain a quoted value.