Fixes Loewdin orthogonalization for isolated systems
Description
Fixes a problem of using the Loewdin orthogonalization for isolated systems, which was not implemented and was causing a segmentation fault.
News snippet
A fix for Loewdin orthogonalization (for DFT+U) for isolated systems.
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.