Debugger: Fix thread name parsing

This was accessing the wrong part of the result item

Change-Id: I0d8b400d04fe93060e41461e77e3226233c4c12d
Reviewed-by: David Schulz <david.schulz@digia.com>
Debugger: Simplify thread parsing code.

Change-Id: Idad3a54305e5da6cd81555815c17c1bd66aa7388
Reviewed-by: hjk <hjk121@nokiamail.com>