Fix darkened video-texture-target #5615
Merged
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Fixes: #5599
This PR fixes darkened video-texture-target problem caused when upgrading our Three.js to r141.
Refer to "Fix darkened camera view" PR #5577 for the details because the root issue is same.
The previous same purpose PR #5604 was reverted because it didn't work correctly because of losing
material.onBeforeRender
when cloning materials. This PR resolves it by copying the function.