scrape-usenet-googlegroups: do not try reusing tokens
scrape-usenet-googlegroups: do not try reusing tokens

I'm sure they *used to* work for multiple posts, but that's not the case
anymore.

grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks