Makes sliderbreaks and misses equal

Someone brought this up during discussion, and from what I can tell, there's no real reason why this wasn't done either.

All this does is use the number of circles instead of the number of objects for accuracy calculations, since circles are the only objects that check for accuracy.

Could also be merged with ppy#27063 to use circles + sliders when sliders check for accuracy (aka when classic mod is disabled). Currently the code for that is included but commented out.

This reverts commit 65e125f.