Bugfix: vtau was not copied to the GPU before computing Int[n vxc].
Description
Bugfix: vtau was not copied to the GPU before computing Int[n vxc].
Closes #992
News snippet
Fix a bug leading to GPU-CPU discrepancy for mGGA energy.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.