should generate 1 chain garbage block per chain ending

[jon12156]

currently, when you get a x2 chain, it drops a x2 (6 wide by 1 tall) garbage block, even if your chain isn't done, and when you've continued and earned a x3 chain, it drops a x3 garbage block (6 wide by 2 tall) in addition to the first garbage block I mentioned, and another with your continued x4 and so on.

The correct behavior is it would add a single garbage block, with the size of course being 6 wide by chain length -1 (up to the limit of garbage block size), to the opponent's garbage queue AFTER there are no more chaining panels in your stack, i.e. your chain has ended.