Fix operator cards db layout in ekomark

[felixhekhorn]

• thanks to @t7phy for detecting this
• no idea how this worked so far e.g. here:

  eko/benchmarks/lha_paper_bench.py

  Line 122 in ca63b0e

  "interpolation_xgrid": lambertgrid(60).tolist(),

• somehow sqlite mapped the name interpolation_xgrid present in the card update to the name xgrid present in the DB
• as already said let's stick to the old names inside ekomark for the time (but only there)

[alecandido]

somehow sqlite mapped the name interpolation_xgrid present in the card update to the name xgrid present in the DB

If sqlite did something (i.e. SQLAlchemy) it is actually using positional arguments, without checking the name.

Otherwise we should have done it somewhere ourselves :)