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 bcac807c848597af62dbb9e39f6978a1d37850d4.
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