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d3d11screencapturesrc: Fix mouse cursor blending

Seungha Yang requested to merge seungha.yang/gstreamer:d3d11capture-mouse-blend into main

Ignore alpha component of source (mouse cursor texture) when blending alpha channel, otherwise the background area of source (which has zeros) will be written to render target. Then it will result in black rectangle if output texture is converted to premultiplied alpha texture

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