Update kli-mgga test
Description
The kli-mgga test used a functional which was broken in libxc, and only got fixed in libxc 6.1.0. In order to avoid splitting of reference values when introducing libxc6 builders, we replace the functional by a different one.
News snippet
Change functional to make test stable against libxc upgrade.
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.