Fixes 2 warnings raised by lou_checktable
Fixes 2 warnings raised by lou_checktable

> fr-bfu-g2.ctb:61: warning: Invalid attribute name: must be a digit between 0 and 7 or a word containing only letters and digits
> fr-bfu-g2.ctb:63: warning: Invalid attribute name: must be a digit between 0 and 7 or a word containing only letters and digits

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