WebGPURenderer: Fix StorageBuffer fallback in WebGLBackend #28722
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Related issue: #28705
Description
The #28705 PR highlighted an existing issue where the PBO system used as the StorageBuffer fallback in the WebGLBackend was using UniformNode instead of TextureNode:
![image](https://private-user-images.githubusercontent.com/15867665/341967547-b0d81c47-9bb6-4359-8315-a959ae1f7336.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.k6sqGHoyMlQintG1bG3GTFrNEYZUiQGCnz8Pvskw8tc)
This contribution is funded by Utsubo