Fix blending equation in SSAARenderPass #25089
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Description
SSAARenderPass currently uses the wrong blending equation to average out several subrenders, this results in opaque objects having less than 1 alpha. This can be seen by adding a red css background to the canvas in the example (https://threejs.org/examples/webgl_postprocessing_ssaa.html).
This PR changes the blending equation to correctly sum the alpha channel instead of repeatedly mixing it.