Fixed bug with un-used green timing
Fixed bug where un-used green timing is not detected.
Example: offset 1, has green timing, offset 2 has exact same green timing. offset 2 is next green timing after offset 1.
Example map:
https://osu.ppy.sh/beatmapsets/890491#mania/1861586
2 un-used timing at 1:26:557 and 1:44:182 in WILD CANNON diff