D3D11: inaccurate color display

Direct3D11 vout rendering colors inaccurately (see smpte-rendering-comparison.png).

For the same picture in 2 resolutions (smpte-color-bars-576p.png, smpte-color-bars-1080p.png) color rendering is different!

VLC: 3.0.0 nightly\ OS: Windows 10 x64 1703\ GPU: NVIDIA GeForce GT 710

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