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 189798fdc0a23e935486d501fc07aadbf42a794f.
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