ldr: create logically replicated table does not correctly resolve database names

I was attempting to set up LDR for the `indexes` workload and observed the following error.

```
ERROR: crdb_internal.start_replication_stream_for_tables(): relation "indexes.indexes" does not exist (SQLSTATE 42P01)
```

I was running the following statement:

```
CREATE LOGICALLY REPLICATED TABLE "indexes.indexes"
FROM TABLE "indexes.indexes" ON 'external://peer'
WITH OPTIONS (unidirectional, MODE = immediate);
```

I think the problem is name resolution doesn't work correctly if the external connection specifies a database other than the database containing the table. Creating the table worked when I changed the external connection to specify the indexes database.

Jira issue: CRDB-49906