VideoCommon: Treat invalid normal count as NormalTangentBinormal

[Pokechu22]

See https://bugs.dolphin-emu.org/issues/13070.

I hardware tested this using the codcamp.dff fifolog from that issue, along with a version I hex-edited, using the hardware fifoplayer: codcamp.7z.zip. Note that the last object in this fifolog needs to be disabled to get rid of a white screen (and the one before it can be removed to disable bloom). Specifically, I edited object 476 on frame 0, at offsets 00175d49 and 00175d54. The default version uses XFMEM_VTXSPECS with Num normals: Invalid (3) and CP_VAT_REG_A with Normal elements: 3 (normal, tangent, binormal) (1), while my hex-edited version uses Num normals: Normal only (1) and Normal elements: 1 (normal) (0). (I had to hex-edit it so that I had working base versions, as changing two fields at once could result in hangs if a frame gets drawn when only one of them is changed).

Here are my results (rows XFMEM_VTXSPECS, columns CP_VAT_REG_A):

	Normal	Normal, Tangent, Binormal
None (10)	Hang	Hang
Normal only (14)	Works	Hang
NTB (18)	Hang	Works
Invalid (1C)	Hang	Works

The hardware fifoplayer didn't make it easy to test no normals enabled at all (since that would involve editing primitive data). I assume that it hangs if XFMEM_VTXSPECS isn't set to None, though.

I also confirmed that Dolphin is rendering the scene (particularly the reflections on the bag) correctly.

[JMC47]

Change is very simple and I checked the game. There's a popup + messages in older builds. No popup in this build.