Remove 'read-only' from storageTextureBindingEntries() (#768)
Remove 'read-only' from storageTextureBindingEntries() (#768)

https://www.w3.org/TR/webgpu/#enumdef-gpustoragetextureaccess
Now only contains "write-only"

Fixes a number of tests in webgpu:api,validation,createBindGroupLayout,*
gpuweb/cts,gpuweb/cts,gpuweb/cts