Fix ASE STRU parser KeyError on LATTICE_PARAMETER block

[mohanchen]

fix #7555

The ASE interface read_stru checked for the LATTICE_PARAMETER block but then indexed blocks['LATTICE_PARAMETERS'] (extra 'S'), so STRU files using LATTICE_PARAMETER instead of LATTICE_VECTORS raised a KeyError (issue #7555). Read from blocks['LATTICE_PARAMETER'][0] instead, since block values are lists of lines. Add a unit test covering a STRU with LATTICE_PARAMETER and no LATTICE_VECTORS.

Verified: python3 -m unittest abacuslite.io.generalio.TestAbacusCalculatorIOUtil -v (10 tests OK, 2 pre-existing skips)

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[kirk0830]

LGTM, this is a not covered use case in previous implementation, thanks for making the ASE interface more robust!