vo_gpu: explicitly label storage image formats

This is apparently required to get storage images working on
windows/vulkan, and probably good practice either way. Not entirely sure
if it's the best idea to be always storing the value as 32-bit float,
but it should hardly matter in practice (since we're only writing one
sample per thread).

(Leaving them implicit requires the shaderStorageImageWriteWithoutFormat
feature to be enabled, which the windows nvidia vulkan driver doesn't
support, at least not for a GTX 670)

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