Cleanup duplicate call (#522)

Luke aka SwissalpS

2019-12-25 76a39e71b9f81531e14efd7ec1b0accfefa0fa66

 technic/machines/LV/extractor.lua

@@ -4,7 +4,7 @@
minetest.register_craft({
   output = 'technic:lv_extractor',
   recipe = {
      {'technic:treetap', 'technic:motor',          'technic:treetap'},
      {'technic:treetap', 'basic_materials:motor',          'technic:treetap'},
      {'technic:treetap', 'technic:machine_casing', 'technic:treetap'},
      {'',                'technic:lv_cable',       ''},
   }