Allow Negative Size/Duration walls for Beatmap V3

[Provini]

CustomJSONData currently has this fixed, but only for V2 Beatmaps. V3 Beatmaps are, however, still affected in v1.39.1

This patch should allow V3 beatmaps that has negative size/duration walls to properly load. I ensured I incorporated this patch similarly to how you did for V2 beatmaps, to ensure it doesn't break mapping extensions.

Feel free to double check my work to make sure I applied this properly, but it seems to work fine for "Superluminal" which utilized negative duration, as a v3 beatmap.

Edit: Fixed formatting and positioning of the patch, as well as commented out the original ObstacleConverter patch.