RectLight doesn't take width / height into account with scenes exported from Arnold #2123
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When we write usd scenes from a quad light, we are authoring both the width / height and also the arnold atribute "vertices", which is reduntant in most cases. Because of that, later on we cannot modify the width / height as it will be overridden by
primvars:arnold:vertices. This PR skips the author of this arnold attribute when possible (i.e. when the vertices positions are centered)Issues fixed in this pull request
Fixes #2122