improve 1D_Hartree Fock test
Description
The 1D_HF test showd a wide spread of values for the gap, which is probably related to the fact, that only one of two degenerate states was included for the ExtraStates. This is now increased to 2.
News snippet
Stabilize 1D_HF test
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.