toke.c: Remove commented-out code

toke.c: Remove commented-out code

This ‘if(){’ has been commented out since it was added in 5db068806.
Presumably the intent was to make the special mad code specific to
PL_madskills at some point and have mad builds running without
PL_madskills follow the same code as regular builds (the *s = '\0' and
PL_bufend assignments).

Since then, though, the standard code has changed to match the mad
code.  The next commit will merge them.