D3D12: Fixed buffer state.
D3D12: Fixed buffer state.

mendsley/bgfx,attilaz/bgfx,jpcy/bgfx,MikePopoloski/bgfx,jdryg/bgfx,emoon/bgfx,attilaz/bgfx,fluffyfreak/bgfx,jdryg/bgfx,emoon/bgfx,mendsley/bgfx,LWJGL-CI/bgfx,septag/bgfx,jpcy/bgfx,jpcy/bgfx,jdryg/bgfx,fluffyfreak/bgfx,MikePopoloski/bgfx,bkaradzic/bgfx,septag/bgfx,LWJGL-CI/bgfx,bkaradzic/bgfx,septag/bgfx,jpcy/bgfx,attilaz/bgfx,jdryg/bgfx,LWJGL-CI/bgfx,mendsley/bgfx,fluffyfreak/bgfx,fluffyfreak/bgfx,MikePopoloski/bgfx,emoon/bgfx,bkaradzic/bgfx,bkaradzic/bgfx,LWJGL-CI/bgfx