message: Reorder wgpu::BackendType to match webgpu.h
diff: "backend type": {
  "category": "enum",
  "values": [
  - {"value": 0, "name": "D3D11"},
  - {"value": 1, "name": "D3D12"},
  - {"value": 2, "name": "metal"},
  - {"value": 3, "name": "vulkan"},
  - {"value": 4, "name": "openGL"},
  - {"value": 5, "name": "openGLES"},
  - {"value": 6, "name": "null"}
  + {"value": 0, "name": "null"},
  + {"value": 1, "name": "D3D11"},
  + {"value": 2, "name": "D3D12"},
  + {"value": 3, "name": "metal"},
  + {"value": 4, "name": "vulkan"},
  + {"value": 5, "name": "openGL"},
  + {"value": 6, "name": "openGLES"}
  ]
  },
  "bind group": {
  