Fix the gradient renderer's use of straight vs premultiplied alpha#1552
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The start and end colors should have premultiplied alpha since they are used when modifying the image surface's data directly (see
GradientRenderer.ProcessGradientLine())Replace
ColorBgra.Blend()withColorBgra.Lerp()for premultiplied alpha (see Add a replacement for ColorBgra.Blend() which didn't use premultiplied alpha #1546)Fixes: #1543