RemoteLinux: Fix key deployment dialog.

When aborting the file dialog, the deployment dialog would not close
on its own.

Change-Id: I614f199b9fd486593e12b18f7f536561e7edae1d
Reviewed-on: http://codereview.qt.nokia.com/2388


Reviewed-by: Christian Kandeler <christian.kandeler@nokia.com>