Editor: Fixed ghost background and environment issue in a New-ed app
#28251
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The issue: ghost background and environment remains in a
New-ed app's UI:dirty.mp4
This PR fixed this UI issue by explicitly assigning null to scene background's UITexture and scene environment's UITexture, in turn viewport.js will assign null to scene.background on sceneBackgroundChanged (same for scene.environment), in this way no ghost textures will be shown in UITexture and Viewport, in a
New-ed app:clean.mp4
Preview: https://raw.githack.com/ycw/three.js/editor-cleared/editor/index.html