Fix gsKit_prim_triangle_3d

[Fancy2209]

gsKit_prim_triangle_gouraud used the right bsize and qsize, but not gsKit_prim_triangle. I am surprised it took 20 years for someone to notice.
It also needs GIF_AD to work for some reason
Fixes #98

[Fancy2209]

I know it's wrong but I am not sure if my fix is right

[rickgaiser]

Looks plausible. You did test before/after?

Before: you have the issue #98 ?
After: the issue is gone?

Fixes #98

[Fancy2209]

Yeah I tested it but I guess I loaded the wrong file :/ We're both working on this, this PR and that issue are directly related

This is what gets rendered with the changes, it's still not right but it's better than before, where it rendered only one tri

I am not sure what else to change, gsKit_prim_triangle_gouraud_3d gives the right output

Maybe it'd be best to just make gsKit_prim_triangle_3d to route to gsKit_prim_triangle_gouraud_3d if there isn't a way to fix it.

[Fancy2209]

@rickgaiser Ok sorry for that, last push fixes it

I was still getting the ropes of stuff, shouldn't have been so sure that was enough to fix it

[rickgaiser]

Not sure why the old code didn't work. There's more primitives NOT using A+D mode and I'm assuming at some point in time they did work.

The new code using A+D mode LGTM, and since you've tested it should be good. Thanks, merging.