VideoCommon: cache the per-vertex position/normal matrix index

[Tilka]

Seems like the position/normal matrix index is also cached (or its resulting matrices, I haven't tested that yet).

I'm not completely happy about the fix yet, but let's get a CI run.

[Pokechu22]

Image from hardware fifoplayer - the mp2 diffs are definitely a bug:

[MayImilae]

Pokechu beat me to it, but here's a hardware test of me just walking up to the spot and getting an approximate recreation.

Confirmed the previous behavior was correct. However, since I'm just in the game, I can move around. Here's the scene from another angle.

The fifolog camera position is to the left of this view. Here, we can see all four boxes that are shown in the fifolog. As is pretty obvious looking at it like this, the top box of the triad of boxes is definitely in view and should be lit. At the very least lit like the boxes below it. The fact that it is not highlighted or lit at all is definitely incorrect.

[dolphin-ci]

FifoCI detected that this change impacts graphical rendering. Here are the behavior differences detected by the system:

• mp2-scanner on ogl-lin-mesa: diff
• mp2-scanner on sw-lin-mesa: diff
• mp2-scanner on mvk-osx-m1: diff
• mp2-scanner on mtl-osx-m1: diff
• mp2-scanner on vk-lin-mesa: diff

_{^{automated-fifoci-reporter}}