Debugger: Fix "attach to QML port"

In this case we don't get any application output / message
telling us that the server is waiting, so let's try to connect
directly.

This is a regression introduced in commit 742019e3

Change-Id: I85d9f846c72e8b227dae5d6e847ab9366a34e2cc
Reviewed-by: Aurindam Jana <aurindam.jana@nokia.com>