Count display for node links should not always be horizontal

Issue Summary

That particular setting is hardcoded in the tweetbutton_link function. Shortly I'll submit a patch which removes the hardcoded setting and lets the (unaltered) theme_tweetbutton_display function sort out the display type. In my case, I want the tweetbutton to appear in the node links without any count at all. I can't achieve this without the code change in my forthcoming patch.