Fix steel strut overlay texture name (#526)

fgrosswig

2020-01-06 7696546d4710ab28e55abd7cde05c1dbcd39cf44

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name = technic
depends = default, pipeworks, technic_worldgen, basic_materials
optional_depends = bucket, screwdriver, mesecons, mesecons_mvps, digilines, digiline_remote, intllib, unified_inventory, vector_extras, dye