nitunit: fix verbose display

`tc.attrs["name"]}` already contains the class namespace

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
Merge: nitunit: fix verbose display

Minor fix:
`tc.attrs["name"]}` already contains the class namespace

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

Pull-Request: #471