Fix check_metadata test
Fix check_metadata test

It was broken by https://github.com/liblouis/liblouis/pull/205

liblouis/liblouis,IndexBraille/liblouis,liblouis/liblouis,BueVest/liblouis,hammera/liblouis,hammera/liblouis,IndexBraille/liblouis,BueVest/liblouis,hammera/liblouis,hammera/liblouis,liblouis/liblouis,BueVest/liblouis,IndexBraille/liblouis,hammera/liblouis,BueVest/liblouis,IndexBraille/liblouis,BueVest/liblouis,liblouis/liblouis,IndexBraille/liblouis,hammera/liblouis,BueVest/liblouis,liblouis/liblouis,liblouis/liblouis