toke.c: Remove obsolete comment

345b37853 removed the associated parameter.
lexsub.t: To-do tests for sort lex_sub
Make ‘No comma allowed’ respect lex subs

$ ./perl -lIlib -XMfeature=:all -e 'sub foo {} print foo,bar'
bar
$ ./perl -lIlib -XMfeature=:all -e 'state sub foo {} print foo,bar'
No comma allowed after filehandle at -e line 1.

This commit makes the latter behave like the former.