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://cdn.statically.io/img/private-user-images.githubusercontent.com/15867665/341967547-b0d81c47-9bb6-4359-8315-a959ae1f7336.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.Oa0BBRUb_Tc_0B2iENulDY9gE1nW0EbO4a0M_4qNoIA)
This contribution is funded by Utsubo