D3D12: Fixed swap chain.
D3D12: Fixed swap chain.

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