missing stream prefix

I was getting an sql error when calling multiple from a template:

> Table 'db_name.default_clinic_physician' doesn't exist

the markup looked like this:

```html
{{ streams:single stream="clinic" where="..." }}
	{{ physicians order_by="sort_name" limit="999" }}
		...
	{{ /physicians }}
{{ /streams:single }}
```

actual table name was `default_str_clinic_physician` so I added the stream prefix and it fixed it. wasn't able to test the field_namespace == 'pages' condition, but I think I put it in the right place