Fix debugging in iOS Simulator

Broke with 3bafbe710f1e1745c0a70031cd1a6a2350addc5f
We need to have the attachPid set with the inferiorPid after we got it
from the iossim tool.

Task-number: QTCREATORBUG-13261
Change-Id: I4f876817bed5566b5025d23416dd85676bc2e68b
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>