display Personas in api search when specifically asked for it (bug 990768)

fix [bug 990768](https://bugzilla.mozilla.org/show_bug.cgi?id=990768)

When searching specifically for Personas (by providing a ```type``` of ```9``` like so: ```http://localhost:8000/en-US/firefox/api/1.5/search/foo/9```, return the Personas found, instead of nothing.