lib/locale.t: Don't skip certain tests

lib/locale.t: Don't skip certain tests

The removed code caused tests to be skipped when the locale doesn't add
any \w characters beyond the C locale.  That meant in practice these
tests were likely skipped only for the C and POSIX locales.  The problem
is that doing this required extra complexity in figuring out how many
tests to skip.  Removing this makes the code easier to understand and
maintain.