MAINT: Small refactor of default outcar parser container

Alexander Tygesenrequested to merge
AlTy/ase:small_vasp_outcar_parser_refactor into master

I just noticed that the signature of the outcar parser container was a little odd. I'm not expecting people to really have made their own versions of this locally, so I just went ahead and changed the signature a little.

Does not change any functionality, just a style thing.

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