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 6d15c9f0eb94c7a93734a5f1b4ad7607a34b6fe8.
Changed the build scripts that WP7 Unit Tests are not executed on Windows 8 because the Emulator does not run anymore
Now with the correct file