Revert "Changed the build scripts that WP7 Uni Tests are not executed on Windows 8 because the Emulator does not run anymore"

This reverts commit f9faa5fb3ee1eacf2af3481786b9c1bae29424ca.
Changed the build scripts that WP7 Uni Tests are not executed on Windows 8 because the Emulator does not run anymore
Now with the correct file