Allow strong_rec_thresh = 0 for only importing perfect 100% matches

[giorgiga]

While a working on my already curated library, I set strong_rec_thresh = 0 and run beet im -q to only import 100% perfect albums (so that I can then look at the rest), but it seems that acts as if -t was specified.

I didn't look at the code, but I guess there's something match_accuracy < strong_rec_thresh?

If that's the case, then IMHO it should check with <= (if one says "the threshold for strong recommendations is 5%", i expect 95% matches and up to be strong recommendations). In case you are concerned about the backwards-compatibility of such change, then handling strong_rec_thresh = 0 would IMHO still be worth it.

BTW: if anyone stumbles upon here because they have the same issue, something like strong_rec_thresh = 0.0001 seems to be a valid workaround.