teapots_galore_id has errors

I've been using the sample models from EXT_mesh_gpu_instancing , and I've been having issues with teapots_galore_id.gltf; after some tests I've noticed it's a malformed model; gltf validator reports this error:

```json
"code": "BUFFER_VIEW_TOO_LONG",
"message": "BufferView does not fit buffer (1) byteLength (83556).",
"severity": 0,
"pointer": "/bufferViews/10/byteLength"
```

@ultrafishotoy Could it be possible to fix that model?

Start with teapots_galore_id.gltf from the EXT_mesh_gpu_instancing sample models and run the gltf validator to inspect bufferViews/10. The work is done when the model no longer reports BUFFER_VIEW_TOO_LONG for that buffer view.

Written by the indexing model from the issue text.