[BEMANI2SM] Shock Arrows/Mine notes bug in Double style

[sillybear]

There is special case for shock arrows placement as seen in DDR 2013's "south" Double Challenge step. It introduced half shock arrows... but right half side consists of all tap notes instead of mines.

Here is a raw ssq file for south: http://www.mediafire.com/download/itbdqyinshs9f3f/south_ssq.zip
Actual south CDP step: https://www.youtube.com/watch?v=0m1c3_9wgU0